Custom report generation

I am trying to create a custom report in Orcad PCB Editor that outputs the internal Part Number we have assigned.
My schematic  symbol has defined a property of "User Part Number". That creates Attached text:
   class      = USER PART NUMBER
   subclass   = ASSEMBLY_TOP
   value      = 5041210
in the footprint.
   
My question is what do I need to add to the symbol to get the part number to show up in the report using:
 
# This is an extract command file
# generated by the Extract UI.
#
COMPONENT
REFDES
REFDES_SORT
SYM_CENTER_X
SYM_CENTER_Y
PART_NUMBER
END