You need to first select what you want to copy. For example, hold down the Copy key and at the same time press the Sel key of the channel you want to copy. That puts its processing parameters on to a ‘clipboard’. Then hold down the Paste key and press the channel Sel key for the channel you want to copy to.

You can copy by holding:

Copy+ Sel (green key) = All channel/mix processing (but not preamp)
Copy+ Mix (blue key) = All channel/mix sends and assignments
Copy+ Compressor Sel key = Just the compressor settings
Copy+ Preamp Sel key = Just the preamp Gain,Pad,48V
and so on…

You can reset parameters in a similar way by holding down the Reset key and simply pressing the Sel or Mix key of the parameters you wish to reset.

I hope that makes sense []
Regards,
Carey