menu.xml

<odoo>
    <data>

        <!--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" />
    </data>
</odoo>