menu.xml

<odoo>
    <!--Setting > Redner -->
    <menuitem id="redner_menu" name="Redner" parent="base.menu_custom" />

    <!--Setting > Redner > Templates-->
    <menuitem
        name="Templates"
        id="redner_template_menu"
        parent="redner_menu"
        action="redner_template_action"
        sequence="8"
    />
</odoo>