partner-contact/partner_multi_relation/views/menu.xml

<?xml version="1.0" encoding="UTF-8"?>
<odoo>

        <menuitem
            id="menu_res_partner_relation"
            name="Relations"
            sequence="3"
            parent="contacts.menu_contacts"
        />

        <menuitem
            id="menu_res_partner_relation_all"
            sequence="3"
            parent="menu_res_partner_relation"
            action="action_res_partner_relation_all"
        />

        <act_window
            id="action_res_partner_relation_type"
            res_model="res.partner.relation.type"
            view_mode="tree,form"
            name="Partner Relations Types"
        />

        <menuitem
            id="menu_res_partner_relation_type"
            name="Relation Types"
            parent="menu_res_partner_relation"
            action="action_res_partner_relation_type"
        />

</odoo>