First of all, with the x36 line of scanners, there is no such thing as a "bank". You have a 3-level hierarchy of systems, departments, and frequencies/talkgroups.
For example, I have a favorite list for common public frequencies. It has one System called "Common Frequencies". This system has several Departments called CB, FRS, GMRS, MURS, etc. Each Department has a list of frequencies associated with that radio service--CB has the frequencies for CB channels 1-40, FRS has the 14 FRS channels, etc. Trunked systems are setup similarly, except you have Sites associated with the system that are assigned actual frequencies, and the 3-level hierarchy becomes systems, departments, and talkgroups.
Sites and systems are tagged with GPS coordinates to mark their location, and a Range parameter to specify how far they can be received. They can be assigned quick keys to toggle them on and off manually, but it is simpler to tell the scanner where you are, either by entering a ZIP code or connecting it to a GPS, and let the scanner automatically enable things in range and disable things out of range.
Everything in the scanner database is also tagged with a Service Type, which indicates what type of traffic. You can select what Service Types you want to listen to. If you select police, fire, and EMS service types, you won't scan railroad, business, aircraft, etc.
You can further refine what you listen to by placing an Avoid on a system, department, or talkgroup/frequency.