When dealing with complex designs and issues day in and day out, sometimes it is the simplest things that trip us up. I fall into that particular catergory today. I had what seemed to be a simple question from a customer who wanted to change the default PT and PC abbreviations to something that complied to the local regulations. Of course I overcomplicated things and ended up spinning my wheels when the answer was right in front of me the whole time: DRAWING SETTINGS>ABBREVIATIONS tab. Here you can change all the default abbreviations found in Civil 3D.