I'm fairly new to Blender. I am trying to inset the roof on the top of this building...the roof is below the top of the walls. As you can see from the picture, the wall is higher than the roof with a thick border along the edge. What I need is a kind of "create inner edge (or cut) along the border" at the same distance from my existing border all the way around so I can keep the wall height and lower the plane of the roof down where it should be. Can someone tell me how to do this?
