I am trying to draw a house with a staircase.
When I get to the top of the staircase on '2nd story' there is no 'hole'. I'd also like to do a minstrel's gallery, so that the corridor on the 2nd story can look down on the first
When I go to the 2nd story, having drawn the walls, the floor is 'auto filled in' for me, and I can't see how to 'cut a section out of it'