I have a beam and a column.  The beam has gusset plates and moment end plates.  The moment beam is bolted to the column.  When I number (automatic numbering) my model it assigns the beam to the column assembly.  How can I change this?   I want the beam and its plates that are welded to the beam to be its own assembly and the Column to be its own assembly.  I've attached the model you can find this issue at column grid line B108.  I've placed the UCS at the beam in question.  

Attachment: DW-7183-.zip