I would like to use my third-party Appletalk printer in Print Center, and I have the PPD. How do I set it up?
If you are still using 10.2 (Jaguar) you may find this answer helpful. Subsequent versions of Print Center do not seem to have any problems adding PPD files. Jaguar’s Print Center program seems not to have been ready for prime-time. Manually selecting a PPD for my printer turned out to require certain steps before I got it to work.