Pro-164 Trunking Primary Control Frequencies only?

[mvinsable]

So, I have had the radioshack pro-164 scanner for almost a week. I have finally figured out how to understand the frequencies and talkgroups. When I look up the city I am trying to program (Bend, Oregon) it gives a list of "primary control frequencies" and then some additional ones. Should I program all the frequencies into the bank, or just the "primary control" ones??

And, if you only need the "primary control" ones, then why do they list the other ones that are not "primary" or "alternative control"?

Also, the bank is set to motorola, and each channel should also me set to "MO", right?

Thank You!!
Looking forward to information.

- Matt