Create an irregular building. Step 02 We have now changed the walls. The next step will be to change the columns. - Edit CR_5 (column row no 5). Mark the the 1:st row with left click and then press Ctrl + Del. Answer OK on the question if you want to delete this row. Do the same thing with CR_6, CR_7, and CR_8. - We have now deleted the columns which were outside the walls. The beams will be shortened automatically.