I have a job in Advance Steel that has tilt-up concrete panels. The roof steelwork will connect to the concrete panels. When I create the concrete panel by using "Other Objects" option "Wall", the panel at the corner of the building automatically join together. I do not want this to happen. The panel have a 16mm gap between them. Is there a way to stop AS joining these panels automatically together at the corners? Attached is my model of the panels.