Actually help from anyone would be welcome!  Anyways, I've grabbed a macro online and use it to export our drawing sheets as DWG with a custom file property as the file name.  The file property referenced for the DWG file name is \$PRPSHEET:"PartNo".  Now I would like to export a DWG with a custom property from the drawing as well as from the model.  I can't figure it out though.  I want the file name to be \$PRP:"SU DRAWING #" - \$PRPSHEET:"PartNo" .DWG.  So using the attached picture as reference, the exported file name would be 13316-030.DWG.  Could anyone show me how to reference a custom property at the drawing level and not on a model level? 

Thank you!