@Anonymous Did you ever find a solution to this?  I have the exact same question.  The online CADmep documentation (see link below) states that the parameters OEM and Product Short Description can be accessed and scheduled in Revit.  But we can't seem to find these fields in the Item within CADmep.

https://help.autodesk.com/view/RVT/2018/ENU/?guid=GUID-50D11C48-1AD4-45C2-BAF1-946EEEB7A6D9

Does anyone know how to use these fields?

Thanks!

Jason