I take it you mean different sites ?
If so the TN750C will store the announcements to the on- board flash card (make sure to back it up).
Once this is done you can move it from site A, and install to site B. The announcement number length must match the dial plan at site B.
I wouldn't alter the numbers of the announcements to suit your dial plan, if you try you could lose them.
I think you need to add the card to the circuit-packs but the Definity may pick this up when you slot the card in.
Add the board in the Data module field with a unique extn number of it's own, again matching your dial plan.
That should be about it. You can see it in "LIST DATA-MODULE" or "LIST EXTENSION-TYPE TYPE DATA-EXTENSION".
Regards,
haico.