I was playing around with surface gui, because I was making a store for my game, and I enabled "Always On Top" what that button does is, it overlapse through all objects in workspace. Now what brought me here is, what if I wanted the gui to overlapse through certain objects, I say this because when you are in the lobby the gui is appearing through the store walls, is there a way to make it overlapse through certain objects?
I am sorry, that is not possible. There is no way of doing what you are saying. It would be nice, but ROBLOX has got many limitations on rendering and else.
So, you can't.