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Navigation Part - Choose position
Currently the Navigation Part allows you to add the content item to a menu, however you are not able to specify a position on the menu, it is added to the root at the end.
A basic solution would be to add a textbox for the user to specify the position such as 2.1.4 as you did with the Advanced Menu. What would be better is if you could choose the position via a popup of the navigation explorer used to manage the menus.