Mark,
The best approach is to add your border cell to the Miscellaneous.cel cell library. Add a tag set to this with tags NOT AN ADDITIONAL cell with a tag set and tags.
You can then modify the PID_DOCUMENT class properties to use these tags and populate the border. See below for the default Tag Set/Tags and PID_DOCUMENT class. Note that the PROPERTY names must match the TAG NAMES - no spaces.
Tag Set and Tags:
PID_DOCUMENT Class and Properties
I hope this helps,
Tony DeRosa
Bentley Plant