Sheet Sets - how to list xref'd drawings

I'm new to BCAD and have used ACAD Sheet Sets a lot.  I cannot find the way for the BCAD Sheet Set panel to list the drawings I use as bases for my sheets (ie: a base floor plan that is xref'd into a reflected ceiling plan sheet).  It is very convenient to be able to open a Sheet Set, then see and open any of the drawings that contribute to the set, even if they are not sheets.  Am I missing something, or is this not a feature of BCAD?