I am looking for a way to make a drawing property sheet specific so that i may more effectively use the custom property editor.

Ex.

I have a assembly with several different components (weldment, valve assembly, junction box, etc). I want to add them all to the same drawing but separate tabs (tab 1 = frame weldment, tab 2 = valve assembly, tab 3 = junction box, etc). The way i have my formats set up is the first drawing number that i assign is used on all sheets. I want to sheet up the "drawing number" property so that is sheet specific. I'm imagining that it would be something like \$PRP:"ProjectNumber"@\$PRP:"SW-Current Sheet(Current Sheet)". Anybody have any input?