mobile dmr hotspot set up

[W4ejv]

I have been successful in setting up my mobile hot spot as far as connecting the pi-3b+ to my ATT Mobile hotspot and scanning it on my config page, My ? is how to add it to config page without screwing up my at home hotspot. I want to save it but don't want to connect and mess up yet. Since this is for mobile use, I would like to keep it on the Same frequency as home that's possible correct ? Sorry if these are stupid ? but again new to DMR.

Thanks, Jim W4ejv