Are you trying to program both frequencies and all four TGs?
If so, you'll have to program two single frequency (DMR one frequency) sytems. One for 154.3700 and one for 155.2800. Then you can enter the two TGs for each frequency.
If you just enter the two frequencies as conventional channels, you won't be able to control what you listen to.
It's kind of annoying trying to figure out what you're hearing if you don't build them as two different one frequency systems.
Since the police use only one TG on their frequency (so far) you can program that in as a conventional frequency.
If I lived up there there, I'd create a separate Favorite List just for Westbrook. As it is, I'll probably just program them in as conventional frequencies since I don't get up that way more than maybe once a year.