How to do a submenu in a sidemenu

I have the basic app (sidemenu).
When opening the menu, I see a list view (menu items).
But I have no idea on how to do submenu. I want next: when i click an item in main menu, i want the list view slide to the left and a new list view to slide in;
I really need multi-level menu.
I found it - but can use it locally. Help me please :frowning: and sorry for my bad english

anybody help… please :pensive:

So you found it, what problem do you have then?