what you are suggesting isn't exactly possible. Games are installed to a specific drive and can only be moved if you clone the drive to the new one. I would do a clean install on the new drive and reinstall the games you want to the secondary drive. If you can't do that why not just clone the whole drive?
I am not saying to copy games, I said copy personal files. Documents, Pictures, maybe saved game files depending on the game, etc. Then do a clean install. Cloning can cause issues, I would rather do a clean install as you first suggested.