Diane I was trying to create the chips.prt file from the Cadence software ConceptHDL (in which I had created my symbols). But I could not figure out a way to do it. However I know that Part developer (from Cadence) can create the chips.prt file. However I never tried it. I used ConceptHDL to create my symbols because of my company requirement. So I was trying to figure out a way to create the chips.prt file thru the software, but could not figure it out. So I created the chips.prt file manually as Kevin said. Anshul