whatsapp_web_groups/views/ww_group_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>
        <!-- Vista de lista -->
        <record id="view_ww_group_list" model="ir.ui.view">
            <field name="name">ww.group.list</field>
            <field name="model">ww.group</field>
            <field name="arch" type="xml">
                <list string="Grupos WhatsApp" editable="bottom">
                    <field name="name"/>
                    <field name="whatsapp_web_id"/>
                    <field name="whatsapp_account_id"/>
                </list>
            </field>
        </record>

        <!-- Vista de formulario -->
        <record id="view_ww_group_form" model="ir.ui.view">
            <field name="name">ww.group.form</field>
            <field name="model">ww.group</field>
            <field name="arch" type="xml">
                <form string="Grupo WhatsApp">
                    <sheet>
                        <group>
                            <field name="name"/>
                            <field name="whatsapp_web_id"/>
                            <field name="whatsapp_account_id"/>
                        </group>
                        <notebook>
                            <page string="Contactos">
                                <field name="contact_ids" widget="many2many_tags"/>
                            </page>
                        </notebook>
                    </sheet>
                </form>
            </field>
        </record>

        <!-- Acción de ventana -->
        <record id="action_ww_group" model="ir.actions.act_window">
            <field name="name">Grupos WhatsApp</field>
            <field name="res_model">ww.group</field>
            <field name="view_mode">list,form</field>
            <field name="help" type="html">
                <p class="o_view_nocontent_smiling_face">
                    No hay grupos de WhatsApp
                </p>
            </field>
        </record>

        <!-- Menú -->
        <menuitem id="menu_whatsapp_web_root"
                  name="WhatsApp Web"
                  sequence="10"/>

        <menuitem id="menu_whatsapp_web_groups"
                  name="Grupos"
                  parent="menu_whatsapp_web_root"
                  action="action_ww_group"
                  sequence="10"/>
    </data>
</odoo>