As the title says, I have a question about this radio.

I currently have one sitting here, and it only has 16 channel I can work with at the moment. I am wanting to program up at least 40, but cannot work out how to enable the other "Zones". Is there anyone here who is more clued up about this than I am? I have absolutely no idea how to do this...
THis radio is meant to have 160 Channel capacity in conventional mode (which I am using)

Any help would be appreciated.