When I tried to create my profile in Domination it said the profile already existed. I tried to use the same info as my MAN profile.

So instead, I tried to Restore Profile. This worked.

Are MAN and Domination both going to be handled under 1 subscription?

Yes for now. MAN will be upgraded to Domination engine, rules, units and maps so Domination and MAN players will play with each other. But while MAN profile should be payed for non-trial status, new profile will work at least for 4 months for the price you've paid for the box.

How do I enter my domination activation code if I restored my MAN profile? I'm stuck in trial mode atm, and with career mode locked up I'm running outta ways to play this game.