skin.shortcuts help building seperate mainmenu?

How do I create and manage a mainmenu seperate to that standard main menu? https://github.com/BigNoid/script.skinsh…submenu.md

I looked at wiki and did as said, I can open a window to edit via skinsettings, but it doesnt get build into the includes files, even though it rewrites it. I have no widget or submenu options either when editer opens?