modeling a portal frame in staad

Hi Guys,

As per attached, I would like to ask for any idea or suggestion how to model in Staad this particular steel framing.

This was submitted by our sub contractor specializing in steel fabrication.

A steel member(labeled 'Portal Frame Column) is attached to a steel column (labeled 'Rigid Frame) by a series of bolts to make it stiffer.

Assume that the full frame is cut at the middle thus showing the section as attached.