I have a Panasonic PBX phone system (D1232) and it has the Caller ID card (KX-TD193) in the first spot in the phone system. I want Caller ID on line 4. How do I get Caller ID to show up on my KX-T7731 phones?

Have CID from the provider of dial tone and the phone needs to ring for that line. Other than that it might need system programming to turn it on in the switch.

Where do I find info on how to do that programing?

Need a manual for the PBX. Or get a tech who knows system.
Depends how much time you want to invest.