I want to create groups when installing my module:

        <record id="bdt_group_dpc" model="res.groups">
            <field name="name">Users: DPC</field>
            <field name="category_id" eval="bdt_category_department"/>
        </record>

Then I can add access rights:

            <record id="bdt_access_bdd_res_partner_currency" model="ir.model.access">
                <field name="name">res partner currency</field>
                <field name="model_id" ref="request_project.model_res_partner_currency"/>
                <field name="perm_read">1</field>
                <field name="perm_write">1</field>
                <field name="perm_unlink">1</field>
                <field name="perm_create">1</field>
                <field name="group_id" eval="bdt_group_bdd"/>
            </record>

But I don't know how to add rows in inherited tab.

It is used implied_ids, but this is defined in an object (that inherits from res_groups) without field _name and it's in the table res_groups_implied_ids, but I don't know how to add anything there.

Actually my problem is with all many2many fields. I don't know how to access the relation table.