when you "arm" (record button) both midi tracks at the same time you can play them both at the same time, no ?
Same with controlling them.
And there is no need to copy|paste anything.
When you mean you want multiple midi-outs assigned to one midi channel, that is not possible in cubase i think, but also not at all necessary since you can just arm any track you want at all times even during recording which is a much more flexible approach. I guess you are used to the reaper approach. but every daw has its own workflow.
Cubase 7.5.x, vienna ensemble pro 5,
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vsti: Steinberg, East West, Vienna, Native Instruments, and a lot of others