I have not been able to get this Solid Element Operation to work and I have a wall under a strait stair and a circular stair just as shown in the example in the New Reference Guide? What might I be doing wrong? I even made a small roof and tried to cut the wall above the stair that way and it still did not work.
I got the roof tool to work. I think the Solid Element Did not work as the Stair was not solid, with open treads, and the wall was not perfectly lined up above the support channel (runner).