Use a portion of a Custom Property

We have a Part Number #####-##-##-10 this number is represented by \$PRP:"PartNoDrawingNo" and evaluates correctly. The last 2 digits represent our detail number. We would like to use this number as an independent field on our Sheet Format.

Is there a way to strip the right two number out =Right(\$PRP:"PartNoDrawingNo",2) in a note or formula?

Thank You

SolidworksDrawings And Detailing