As I re read my post, let me be a little more clear.

I have my scanner programmed, and I can listen to all of the City PD
and County Sheriff, along with snow plows and city maintance crews.

All that I want to listen to is Fire calls. (I'm a ff. and I like
knowing what is going on when it is busy).
The book tells me that I can plug the code in and only listen to what I
want to hear but I'll be darned if I can get it to do it.