The best way is to use the Sentinel software.
Create one favorites list.
Go to your state and county in the database and pick through what is there. When you see something you want, right click and append tou your new favorites list. The first time you do this you get a chance to name the new list.
Pick just the stuff you want. By drilling down in the database stuff tou can get it down to just single talkgroups on a site, etc. in other words... just your police or fire and not the whole county.
Then you might want to go through the statewide and possibly national stuff to see if there is anything you might want to add. Might be CB, FRS or railroads, marine frequencies, whatever. Again, only add the channels you want to monitor. I would put as few on as possible to start. You can always add more later.
Then....
Go into the edit-profile.
Tturn OFF the Full Database and just turn on your favorites list. Now you are in full control of what is monitored.
Upload to the scanner. Only active stuff from your list will play.
Mark
536HP/HP1e/HP2e/996P2/996XT
996T/396XT(2)/PSR800/PRO668