Adding a custom property to a dimension

I have a location that I call out as "1.375, 24 PL", (this is not a hole, so hole call out won't work)

Right now the 24 is manually typed in.  What I would like to do is link the 24 to the models custom property "slot qty".

I have tried

, \$PRPMODEL:"SLOT QTY" PL

, <\$PRPMODEL:"SLOT QTY">PL

, PL

, SLOTQTY@CirPattern3 SLOTS PL

Is there a way to do this using SolidWorks 9 Service Pack 4.1?

Thanks

Misty

SolidworksDrawings And Detailing