I don't understand your question.
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Welcome to the forum.
It sounds like you have footage, that was NOT shot on greenscreen, but you wish to knock out the subject, like with greenscreen. If so, then do you have After Effects? If so, see the Rotobrush in AE.
If I missed what you wish to do, then just ignore my post.
Work on the mask and replacement of footage first. Then export that out as a new, composited video file. Import that back into PP and use that composite as your replacement layer in the green screen shot.
bingo! That will do the trick! Dont know why I didnt think of it!
@Bill, I know it can be done (perhaps easier) in AE, but most of my Adobe collection is the Adobe Video Collection which had Premiere Pro 1.5, Photoshop CS2, etc. So my AE is quite old and I have found it to be less than useful in the past. When I upgraded I could not afford the new Suite, so I just purchased Premiere 5.5 (which thankfully came with Encore woot!), but the old version of AE I have can only do frame-by-frame rotoscoping... which is a bit painful to use for something that is just for fun.