1) Just the control channels.
2) No.
To expand: in PSR-500/-600 speak, there is no such thing as a "trunking object." First you have to program a "trunked system." (It so happens this takes up 10 objects, but you don't have to worry about that.) A trunked system consists of the control channels, a format (such as 800 SmartZone or Astro), and perhaps channel plan.
After programming a trunked system, you can then program "talkgroup objects," where each object is a talkgroup on that trunked system.
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