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>