dagwoodsystems has you in the right direction. The coverage answer group will do what you need.

The commands are

"li cov answ" This will list the ones you already have.

"add cov answ n" This will add the next available one for you.
You will need to point this to a DID station. It can be one that is x ported. Add a coverage path to this station and put c? (your coverage answer group number)as the first point of coverage, however many rings and your audix as the second point.

IT should work for you. Post if you need any more help getting through this.

Mike Jones
"A people that values its privileges above its principles soon loses both."
- Dwight D. Eisenhower (1890-1969), Inaugural Address, January 20, 1953