Doing it by hand is nothing to be ashamed of, some times the programming software is harder anyways.
Did you recall programming in anything like talkgroups, or did you just end up putting in frequencies? If you managed to program in talk groups when you programmed in that analog trunking system, you can enable / lockout the talkgroups (TGID) that you do not want. If you programmed in the trunking system and have it on ID SEARCH option (depending on your scanner) it will pick up everything, and you can lock out what you want....If you just programmed in the frequencies w/o setting up a trunking system and are manually scanning the frequencies, you will have no say over what your scanner picks up.
With a trunking scanner, you will be locking out talk groups...not frequencies, in a trunking system.