I'm using Home Designer Suite 2020. I am professional drafter using AutoCad. I am totally new to this type of program. The walls of the RV garage are about 18' high plus or minus, and I couldn't figure out how to adjust the height of the walls beyond single story, so when I generated the second floor I ended up with unwanted floor joists. I want to keep the top plates where they are, I just want the joists deleted.