Do you not like having to exit one level and go to another level to check where the postion should be then changing back?
Well, you can open three/two Editor 3D windows at once with one window being the first level and the next window being lev 2. etc.
It's so much easier, all you have to do is just "Switch windows" to check a postion and quickly go back to the other level to enter the postion in.