from the second link:
Define new property set definitions
Open the PropertySetDefs.dwg file.
If you work with imperial units, this file is stored in the \...\Content\Imperial\Schedules\ folder. If you work with metric units, this file is stored in the \...\Content\Metric\Schedules\ folder.From the Documentation menu, choose Schedule Data > Property Set Definitions.
In the Property Set Definitions dialog box, choose New.
Enter the name of the new property set definition created in the Modify the existing block definition procedure and choose OK.
Repeat step 4 for each new property set definition you created in the Modify the existing block definition procedure.
Choose OK and save the PropertySetDefs.dwg file
so, I guess technically it ISN"T part of the display rep sets.....sorry...however the file you need is the one shown in RED above