Hi Vasanth, thanks for response

My problem is that it is a menu of POS (Point of sale), ie, is in another module, and I want to call my module.
The example show me, I added a level below the same menu.

But thanks to your example I could guide me.

The correct answer is:

<menuitem name = "orders" parent = "my_submenu" id = "another_id" action = "point_of_sale.action_pos_pos_form" />

and this shows: http://prntscr.com/6agoe2

Thanks for Vasanth guide