That would be
ARC-XT, not ARC-396, since the OT said he has a 396XT...
To expand a little on rty's response...
These radios don't work the same way as old 'bank driven' scanners do. The user is responsible for alloting systems, sites and groups from a pool of available memory. Before you do anything, it would be a very good idea to sit down with the Easier to Read manual and go through it a couple of times. We also have several article linked in the following (all links are blue) to help, particularly with trunking, which is where many newcomers get tripped up
Program your DMA Scanner - The RadioReference Wiki
You can also ask in your state's forum (where are you -county/state is fine) for a file. Be sure to be specific about the software you're using - not all formats can be imported
Mike