I found what I was looking for. It was this:
1. At “Terminals & Sets” press NEXT until the display reads “System programming”.
2. Press SHOW. The display reads “Hunt Groups”. Press NEXT twice.
3. The display reads “Featr settings”. Press SHOW. Then press NEXT until the display reads “Set relocation:?”. Use CHANGE to toggle Y to move phones, N to turn feature off. Exit programming.
4. Unplug the phone(s) you want to move. Unplug a maximum of two at a time. Plug in the first set you unplugged at the new location. Wait five minutes for the set to “read” its new location, then press Feature *0, and press an intercom button. The display will show the extension number and name. If correct, you may now plug the other phone in to its new location. Wait five minutes to check the status using Feature *0. Deactivate Set Relocation after moving phones.
Thanks for your help though.