You should be able to find information about this in some of the other posts around. That said, one easy thing you could do is to start by making a local copy of the templates shipped with NX6 ( ..\UGS\NX 6.0\UGII\templates), then editing the appropriate ones you want. To access the borders, you need to make sure that the appropriate layers (ie: Layer 256) are editable and not just visible.
The keywords are pallets and patterns. I found this so cumbersome and the results so unreliable however (sometimes it loaded, sometimes it didn't, sometimes it updated, sometimes it didn't), that I decided to draw a template using ordinairy curves. Save it as a part file. And then simply import it in the drawing. It is not linked, so once it's there, it's there. But then again, I wasn't able to get it linked to a master anyway.
