Is it possible to restore the navigation menu

I bought too many components and I tried to simplify the navigation menu by using only the home page of the module... It's really not the results I was looking for since the sub-menu is not showing up in the home page of the module. Is it possible to restore the navigation menu?

Thank you...

I will do it manually - If there's no solution about this It might be a good suggestion just to have a button "Restore Menu" for each modules.