Hello there; I'm solving a steel fire escape. I want to use 2 UNP200 profiles side by side. I'm merging these two columns with the source. However, I cannot add a single plate to this column for the foundation -column foot. When I choose a fake column, the profile dimensions are insufficient. What should I do about this? Should I choose my box profile like 200*150 instead of 2 UNP200? I'm also getting the floor offset issue in the y direction. At the same time, it does not give the source combinations properly. What is the reason of this? I am sharing the project and pictures in the attachment. Thanks in advance.