copy and paste will be your friends, you can paste just content, I think this should leave your keyframes, if not you can paste motion.
Hope this helps, Matt.
You can do it in motion. How long it will take will depend on how long the shots are. I assume the chair doesn’t move so you are only going to be working on the area where he overlaps the chair. The less he moves the easier it will be.
Matt.
I don’t know if this would apply to you but … I have had issues where just the transitions have been rendered with the wrong field dominance. I think this particularly can happen if you paste a sequence into a sequence with a different field dominance. You might search the cow forums, I found one link https://forums.creativecow.net/thread/8/973465 Previously I found a really good discussion but of course I can’t find it now. I hope this helps.
Matt.