I had a need to setup Zones 1 and 2 on my two Uniden handhelds (a 396XT and a 346XT). Since the 346XT can't handle digital, I broke each Fleetnet zone into two separate systems, one for digital and one for analog. In the digital system I put all of the digital talkgroups, and in the analog one I put all of the analog talkgroups. Then I could upload both to the 396XT but just the analog system to the 346XT.
I don't know if anyone else has a need for this but I thought I'd post it here just in case.
P.S. All of the sites and groups in each system are fully gps-enabled.