1. so you can't put an building in a empty space? i will try to replicate this issue
2. so they way you can make a new school is by using planes in the hierarchy tab which is this press right click go to 3D object than Plane
3. what do you mean by reset? you mean remove the school? if so than just press right click on the Environment in the hierarchy tab and press delete
4. well i dunno what you mean so i will say anything you want to
5. same as 4.
