diff --git a/setup/web_m2x_options_manager/odoo/addons/web_m2x_options_manager b/setup/web_m2x_options_manager/odoo/addons/web_m2x_options_manager
new file mode 120000
index 000000000..53b3da28c
--- /dev/null
+++ b/setup/web_m2x_options_manager/odoo/addons/web_m2x_options_manager
@@ -0,0 +1 @@
+../../../../web_m2x_options_manager
\ No newline at end of file
diff --git a/setup/web_m2x_options_manager/setup.py b/setup/web_m2x_options_manager/setup.py
new file mode 100644
index 000000000..28c57bb64
--- /dev/null
+++ b/setup/web_m2x_options_manager/setup.py
@@ -0,0 +1,6 @@
+import setuptools
+
+setuptools.setup(
+    setup_requires=['setuptools-odoo'],
+    odoo_addon=True,
+)
diff --git a/web_m2x_options_manager/__init__.py b/web_m2x_options_manager/__init__.py
new file mode 100644
index 000000000..2a7f1c54a
--- /dev/null
+++ b/web_m2x_options_manager/__init__.py
@@ -0,0 +1,4 @@
+# Copyright 2021 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from . import models
diff --git a/web_m2x_options_manager/__manifest__.py b/web_m2x_options_manager/__manifest__.py
new file mode 100644
index 000000000..68d81d280
--- /dev/null
+++ b/web_m2x_options_manager/__manifest__.py
@@ -0,0 +1,23 @@
+# Copyright 2021 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+{
+    "name": "Web M2X Options Manager",
+    "summary": 'Adds an interface to manage the "Create" and'
+    ' "Create and Edit" options for specific models and'
+    " fields.",
+    "version": "14.0.1.0.0",
+    "author": "Camptocamp, Odoo Community Association (OCA)",
+    "license": "AGPL-3",
+    "category": "Web",
+    "data": [
+        "security/ir.model.access.csv",
+        "views/ir_model.xml",
+    ],
+    "demo": [
+        "demo/res_partner_demo_view.xml",
+    ],
+    "depends": ["base", "web_m2x_options"],
+    "website": "https://github.com/OCA/web",
+    "installable": True,
+}
diff --git a/web_m2x_options_manager/demo/res_partner_demo_view.xml b/web_m2x_options_manager/demo/res_partner_demo_view.xml
new file mode 100644
index 000000000..8a53c630c
--- /dev/null
+++ b/web_m2x_options_manager/demo/res_partner_demo_view.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<odoo>
+
+    <record id="res_partner_demo_form_view" model="ir.ui.view">
+        <field name="name">res.partner.demo.form.view</field>
+        <field name="model">res.partner</field>
+        <field name="priority">1000</field>
+        <field name="arch" type="xml">
+            <form>
+                <sheet>
+                    <group>
+                        <!-- Many2one -->
+                        <field name="title" />
+                        <!-- Many2many -->
+                        <field name="category_id" options="{'create': False}" />
+                        <!-- One2many -->
+                        <field name="user_ids">
+                            <tree>
+                                <!-- Many2one within tree -->
+                                <field name="company_id" options="{'create': False}" />
+                            </tree>
+                        </field>
+                    </group>
+                </sheet>
+            </form>
+        </field>
+    </record>
+
+</odoo>
diff --git a/web_m2x_options_manager/models/__init__.py b/web_m2x_options_manager/models/__init__.py
new file mode 100644
index 000000000..699352799
--- /dev/null
+++ b/web_m2x_options_manager/models/__init__.py
@@ -0,0 +1,6 @@
+# Copyright 2021 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from . import ir_model
+from . import ir_ui_view
+from . import m2x_create_edit_option
diff --git a/web_m2x_options_manager/models/ir_model.py b/web_m2x_options_manager/models/ir_model.py
new file mode 100644
index 000000000..e51446572
--- /dev/null
+++ b/web_m2x_options_manager/models/ir_model.py
@@ -0,0 +1,52 @@
+# Copyright 2021 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import api, fields, models
+
+
+class IrModel(models.Model):
+    _inherit = "ir.model"
+
+    m2x_create_edit_option_ids = fields.One2many(
+        "m2x.create.edit.option",
+        "model_id",
+    )
+
+    def button_empty(self):
+        for ir_model in self:
+            ir_model._empty_m2x_create_edit_option()
+
+    def button_fill(self):
+        for ir_model in self:
+            ir_model._fill_m2x_create_edit_option()
+
+    def _empty_m2x_create_edit_option(self):
+        """Removes every option for model ``self``"""
+        self.ensure_one()
+        self.m2x_create_edit_option_ids.unlink()
+
+    def _fill_m2x_create_edit_option(self):
+        """Adds every missing field option for model ``self``"""
+        self.ensure_one()
+        existing = self.m2x_create_edit_option_ids.mapped("field_id")
+        valid = self.field_id.filtered(lambda f: f.ttype in ("many2many", "many2one"))
+        vals = [(0, 0, {"field_id": f.id}) for f in valid - existing]
+        self.write({"m2x_create_edit_option_ids": vals})
+
+
+class IrModelFields(models.Model):
+    _inherit = "ir.model.fields"
+
+    @api.model
+    def name_search(self, name="", args=None, operator="ilike", limit=100):
+        res = super().name_search(name, args, operator, limit)
+        if not (name and self.env.context.get("search_by_technical_name")):
+            return res
+        domain = list(args or []) + [("name", operator, name)]
+        new_fids = self.search(domain, limit=limit).ids
+        for fid in [x[0] for x in res]:
+            if fid not in new_fids:
+                new_fids.append(fid)
+        if limit and limit > 0:
+            new_fids = new_fids[:limit]
+        return self.browse(new_fids).sudo().name_get()
diff --git a/web_m2x_options_manager/models/ir_ui_view.py b/web_m2x_options_manager/models/ir_ui_view.py
new file mode 100644
index 000000000..172ef6696
--- /dev/null
+++ b/web_m2x_options_manager/models/ir_ui_view.py
@@ -0,0 +1,20 @@
+# Copyright 2021 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import models
+
+
+class IrUiView(models.Model):
+    _inherit = "ir.ui.view"
+
+    def postprocess(self, node, current_node_path, editable, name_manager):
+        res = super().postprocess(node, current_node_path, editable, name_manager)
+        if node.tag == "field":
+            mname = name_manager.Model._name
+            fname = node.attrib["name"]
+            field = self.env[mname]._fields.get(fname)
+            if field and field.type in ("many2many", "many2one"):
+                rec = self.env["m2x.create.edit.option"].get(mname, field.name)
+                if rec:
+                    rec._apply_options(node)
+        return res
diff --git a/web_m2x_options_manager/models/m2x_create_edit_option.py b/web_m2x_options_manager/models/m2x_create_edit_option.py
new file mode 100644
index 000000000..07ae01e77
--- /dev/null
+++ b/web_m2x_options_manager/models/m2x_create_edit_option.py
@@ -0,0 +1,170 @@
+# Copyright 2021 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import _, api, fields, models
+from odoo.exceptions import ValidationError
+from odoo.tools.cache import ormcache
+from odoo.tools.safe_eval import safe_eval
+
+
+class M2xCreateEditOption(models.Model):
+    _name = "m2x.create.edit.option"
+    _description = "Manage Options 'Create/Edit' For Fields"
+
+    field_id = fields.Many2one(
+        "ir.model.fields",
+        domain=[("ttype", "in", ("many2many", "many2one"))],
+        ondelete="cascade",
+        required=True,
+        string="Field",
+    )
+
+    field_name = fields.Char(
+        related="field_id.name",
+        store=True,
+        string="Field Name",
+    )
+
+    model_id = fields.Many2one(
+        "ir.model",
+        ondelete="cascade",
+        required=True,
+        string="Model",
+    )
+
+    model_name = fields.Char(
+        compute="_compute_model_name",
+        inverse="_inverse_model_name",
+        store=True,
+        string="Model Name",
+    )
+
+    option_create = fields.Selection(
+        [
+            ("none", "Do nothing"),
+            ("set_true", "Add"),
+            ("force_true", "Force Add"),
+            ("set_false", "Remove"),
+            ("force_false", "Force Remove"),
+        ],
+        default="set_false",
+        help="Defines behaviour for 'Create' option:\n"
+        "* Do nothing: nothing is done\n"
+        "* Add/Remove: option 'Create' is set to True/False only if not"
+        " already present in view definition\n"
+        "* Force Add/Remove: option 'Create' is always set to True/False,"
+        " overriding any pre-existing option",
+        required=True,
+        string="Create Option",
+    )
+
+    option_create_edit = fields.Selection(
+        [
+            ("none", "Do nothing"),
+            ("set_true", "Add"),
+            ("force_true", "Force Add"),
+            ("set_false", "Remove"),
+            ("force_false", "Force Remove"),
+        ],
+        default="set_false",
+        help="Defines behaviour for 'Create & Edit' option:\n"
+        "* Do nothing: nothing is done\n"
+        "* Add/Remove: option 'Create & Edit' is set to True/False only if not"
+        " already present in view definition\n"
+        "* Force Add/Remove: option 'Create & Edit' is always set to"
+        " True/False, overriding any pre-existing option",
+        required=True,
+        string="Create & Edit Option",
+    )
+
+    _sql_constraints = [
+        (
+            "model_field_uniqueness",
+            "unique(field_id,model_id)",
+            "Options must be unique for each model/field couple!",
+        ),
+    ]
+
+    @api.model_create_multi
+    def create(self, vals_list):
+        # Clear cache to avoid misbehavior from cached :meth:`_get()`
+        type(self)._get.clear_cache(self.browse())
+        return super().create(vals_list)
+
+    def write(self, vals):
+        # Clear cache to avoid misbehavior from cached :meth:`_get()`
+        type(self)._get.clear_cache(self.browse())
+        return super().write(vals)
+
+    def unlink(self):
+        # Clear cache to avoid misbehavior from cached :meth:`_get()`
+        type(self)._get.clear_cache(self.browse())
+        return super().unlink()
+
+    @api.depends("model_id")
+    def _compute_model_name(self):
+        for opt in self:
+            opt.model_name = opt.model_id.model
+
+    def _inverse_model_name(self):
+        getter = self.env["ir.model"]._get
+        for opt in self:
+            # This also works as a constrain: if ``model_name`` is not a
+            # valid model name, then ``model_id`` will be emptied, but it's
+            # a required field!
+            opt.model_id = getter(opt.model_name)
+
+    @api.constrains("model_id", "field_id")
+    def _check_field_in_model(self):
+        for opt in self:
+            if opt.field_id.model_id != opt.model_id:
+                msg = _("'%s' is not a valid field for model '%s'!")
+                raise ValidationError(msg % (opt.field_name, opt.model_name))
+
+    @api.constrains("field_id")
+    def _check_field_type(self):
+        ttypes = ("many2many", "many2one")
+        if any(o.field_id.ttype not in ttypes for o in self):
+            msg = _("Only Many2many and Many2one fields can be chosen!")
+            raise ValidationError(msg)
+
+    def _apply_options(self, node):
+        """Applies options ``self`` to ``node``"""
+        self.ensure_one()
+        options = node.attrib.get("options") or {}
+        if isinstance(options, str):
+            options = safe_eval(options, dict(self.env.context or [])) or {}
+        for k in ("create", "create_edit"):
+            opt = self["option_%s" % k]
+            if opt == "none":
+                continue
+            mode, val = opt.split("_")
+            if mode == "force" or k not in options:
+                options[k] = val == "true"
+        node.set("options", str(options))
+
+    @api.model
+    def get(self, model_name, field_name):
+        """Returns specific record for ``field_name`` in ``model_name``
+
+        :param str model_name: technical model name (i.e. "sale.order")
+        :param str field_name: technical field name (i.e. "partner_id")
+        """
+        return self.browse(self._get(model_name, field_name))
+
+    @api.model
+    @ormcache("model_name", "field_name")
+    def _get(self, model_name, field_name):
+        """Inner implementation of ``get``.
+        An ID is returned to allow caching (see :class:`ormcache`); :meth:`get`
+        will then convert it to a proper record.
+
+        :param str model_name: technical model name (i.e. "sale.order")
+        :param str field_name: technical field name (i.e. "partner_id")
+        """
+        dom = [
+            ("model_name", "=", model_name),
+            ("field_name", "=", field_name),
+        ]
+        # `_check_field_model_uniqueness()` grants uniqueness if existing
+        return self.search(dom, limit=1).id
diff --git a/web_m2x_options_manager/readme/CONTRIBUTORS.rst b/web_m2x_options_manager/readme/CONTRIBUTORS.rst
new file mode 100644
index 000000000..02ad49af4
--- /dev/null
+++ b/web_m2x_options_manager/readme/CONTRIBUTORS.rst
@@ -0,0 +1,3 @@
+* `Camptocamp <https://www.camptocamp.com>`__:
+
+  * Silvio Gregorini
diff --git a/web_m2x_options_manager/readme/DESCRIPTION.rst b/web_m2x_options_manager/readme/DESCRIPTION.rst
new file mode 100644
index 000000000..8a8a770d3
--- /dev/null
+++ b/web_m2x_options_manager/readme/DESCRIPTION.rst
@@ -0,0 +1,2 @@
+Allows managing the "Create..." and "Create and Edit..." options for `Many2one`
+and `Many2many` fields directly from the `ir.model` form view.
diff --git a/web_m2x_options_manager/readme/USAGE.rst b/web_m2x_options_manager/readme/USAGE.rst
new file mode 100644
index 000000000..a68d0f1b6
--- /dev/null
+++ b/web_m2x_options_manager/readme/USAGE.rst
@@ -0,0 +1,7 @@
+Go to Settings > Technical > Models.
+
+Choose the model you wish to edit, and open its form view. Go to the
+"Create/Edit Options" tab, and add the fields you want to manage.
+
+Button "Fill" will add every missing field to the options.
+Button "Empty" will remove every option.
diff --git a/web_m2x_options_manager/security/ir.model.access.csv b/web_m2x_options_manager/security/ir.model.access.csv
new file mode 100644
index 000000000..796d5b922
--- /dev/null
+++ b/web_m2x_options_manager/security/ir.model.access.csv
@@ -0,0 +1,3 @@
+id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
+access_m2x_create_edit_option_user,access_m2x_create_edit_option_user,model_m2x_create_edit_option,base.group_user,1,0,0,0
+access_m2x_create_edit_option_system,access_m2x_create_edit_option_system,model_m2x_create_edit_option,base.group_system,1,1,1,1
diff --git a/web_m2x_options_manager/static/description/icon.png b/web_m2x_options_manager/static/description/icon.png
new file mode 100644
index 000000000..3a0328b51
Binary files /dev/null and b/web_m2x_options_manager/static/description/icon.png differ
diff --git a/web_m2x_options_manager/tests/__init__.py b/web_m2x_options_manager/tests/__init__.py
new file mode 100644
index 000000000..f803479e2
--- /dev/null
+++ b/web_m2x_options_manager/tests/__init__.py
@@ -0,0 +1,4 @@
+# Copyright 2021 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from . import test_m2x_create_edit_option
diff --git a/web_m2x_options_manager/tests/test_m2x_create_edit_option.py b/web_m2x_options_manager/tests/test_m2x_create_edit_option.py
new file mode 100644
index 000000000..de6e1d8c0
--- /dev/null
+++ b/web_m2x_options_manager/tests/test_m2x_create_edit_option.py
@@ -0,0 +1,109 @@
+# Copyright 2021 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from lxml import etree
+
+from odoo.exceptions import ValidationError
+from odoo.tests.common import SavepointCase
+from odoo.tools.safe_eval import safe_eval
+
+
+class TestM2xCreateEditOption(SavepointCase):
+    def setUp(self):
+        super(TestM2xCreateEditOption, self).setUp()
+        ref = self.env.ref
+        # View to be used
+        self.view = ref("web_m2x_options_manager.res_partner_demo_form_view")
+        # res.partner model and fields
+        self.res_partner_model = ref("base.model_res_partner")
+        self.categ_field = ref("base.field_res_partner__category_id")
+        self.title_field = ref("base.field_res_partner__title")
+        self.users_field = ref("base.field_res_partner__user_ids")
+        # res.users model and fields
+        self.res_users_model = ref("base.model_res_users")
+        self.company_field = ref("base.field_res_users__company_id")
+        # Options setup
+        self.title_opt = self.env["m2x.create.edit.option"].create(
+            {
+                "field_id": self.title_field.id,
+                "model_id": self.res_partner_model.id,
+                "option_create": "set_true",
+                "option_create_edit": "set_true",
+            }
+        )
+        self.categories_opt = self.env["m2x.create.edit.option"].create(
+            {
+                "field_id": self.categ_field.id,
+                "model_id": self.res_partner_model.id,
+                "option_create": "set_true",
+                "option_create_edit": "set_true",
+            }
+        )
+        self.company_opt = self.env["m2x.create.edit.option"].create(
+            {
+                "field_id": self.company_field.id,
+                "model_id": self.res_users_model.id,
+                "option_create": "force_true",
+                "option_create_edit": "set_true",
+            }
+        )
+
+    def test_errors(self):
+        with self.assertRaises(ValidationError):
+            # Fails ``_check_field_in_model``: model is res.partner, field is
+            # res.users's company_id
+            self.env["m2x.create.edit.option"].create(
+                {
+                    "field_id": self.company_field.id,
+                    "model_id": self.res_partner_model.id,
+                    "option_create": "set_true",
+                    "option_create_edit": "set_true",
+                }
+            )
+        with self.assertRaises(ValidationError):
+            # Fails ``_check_field_type``: users_field is a One2many
+            self.env["m2x.create.edit.option"].create(
+                {
+                    "field_id": self.users_field.id,
+                    "model_id": self.res_partner_model.id,
+                    "option_create": "set_true",
+                    "option_create_edit": "set_true",
+                }
+            )
+
+    def test_apply_options(self):
+        res = self.env["res.partner"].fields_view_get(self.view.id)
+
+        # Check fields on res.partner form view
+        form_arch = res["arch"]
+        form_doc = etree.XML(form_arch)
+        title_node = form_doc.xpath("//field[@name='title']")[0]
+        self.assertEqual(
+            safe_eval(title_node.attrib.get("options"), nocopy=True),
+            {"create": True, "create_edit": True},
+        )
+        categ_node = form_doc.xpath("//field[@name='category_id']")[0]
+        self.assertEqual(
+            safe_eval(categ_node.attrib.get("options"), nocopy=True),
+            {"create": False, "create_edit": True},
+        )
+
+        # Check fields on res.users tree view (contained in ``user_ids`` field)
+        tree_arch = res["fields"]["user_ids"]["views"]["tree"]["arch"]
+        tree_doc = etree.XML(tree_arch)
+        company_node = tree_doc.xpath("//field[@name='company_id']")[0]
+        self.assertEqual(
+            safe_eval(company_node.attrib.get("options"), nocopy=True),
+            {"create": True, "create_edit": True},
+        )
+
+        # Update options, check that node has been updated too
+        self.title_opt.option_create_edit = "force_false"
+        res = self.env["res.partner"].fields_view_get(self.view.id)
+        form_arch = res["arch"]
+        form_doc = etree.XML(form_arch)
+        title_node = form_doc.xpath("//field[@name='title']")[0]
+        self.assertEqual(
+            safe_eval(title_node.attrib.get("options"), nocopy=True),
+            {"create": True, "create_edit": False},
+        )
diff --git a/web_m2x_options_manager/views/ir_model.xml b/web_m2x_options_manager/views/ir_model.xml
new file mode 100644
index 000000000..d05011571
--- /dev/null
+++ b/web_m2x_options_manager/views/ir_model.xml
@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<odoo>
+
+    <record id="view_model_form_inherit" model="ir.ui.view">
+        <field name="name">view.model.form.inherit</field>
+        <field name="model">ir.model</field>
+        <field name="inherit_id" ref="base.view_model_form" />
+        <field name="arch" type="xml">
+            <xpath expr="//notebook/page[@name='fields']" position="after">
+                <page string="Create/Edit Options" name="create_edit_options">
+                    <div>
+                        <button name="button_fill" type="object" string="Fill" />
+                        <button name="button_empty" type="object" string="Empty" />
+                    </div>
+                    <field
+                        name="m2x_create_edit_option_ids"
+                        nolabel="1"
+                        context="{'default_model_name': model}"
+                    >
+                        <tree string="Fields Description" editable="bottom">
+                            <field name="model_name" invisible="1" />
+                            <field
+                                name="field_id"
+                                context="{'search_by_technical_name': True, 'display_technical_name': True}"
+                                domain="[('ttype', 'in', ('many2many', 'many2one')), ('model_id.model', '=', model_name)]"
+                                options="{'create': False, 'create_edit': False}"
+                            />
+                            <field name="option_create" />
+                            <field name="option_create_edit" />
+                        </tree>
+                    </field>
+                </page>
+            </xpath>
+        </field>
+    </record>
+
+</odoo>