I find myself wanting to do this very often. I create a section of the building before I start modeling too far. That way levels and other items are pretty accurate. Now my issue is, after I block out a section of a wall, sometimes I want to model a mass of it for the elevations. To do that, I'd like to start by tracing what I detailed and then sweep it or extrude it or what have you. However, I see no way to set the work plane while in the section. I can select a grid line that is close to my cut but I want the section I am drawing in to be the actual work plane. Is there a way to accomplish this?