Is there a way to start again with a character but keep his spells or talents on Dragon Age 2?

I have tried starting again on Dragon Age 2 on Nightmare, and it seems nearly impossible.

So could I start again with a character I have completed the game with, but keep his level and talents???Is there a way to start again with a character but keep his spells or talents on Dragon Age 2?
There isn't any NG+ option like Mass Effect. If you are on the PC though, it's possible you can find a mod for this. Otherwise, you could just play on normal for the regular battles to gain levels, and then put it up to nightmare for the boss fights.