easiest way to copy an out line is double click on the movie clip or animation , you can then select either the fill or outline ,
i think i would copy the outline , then right right click , paste in place , u can change the color of the second layer
I tried your approach, I figured it's unpractical, because think about it, when I have on layer A my unfinished outline and I copy it to layer B and then colorize it, then continue working on the outline on layer A I'll then have an finished outline on layer A and an unfinished outline on layer B, those two will overlap and I also can't separate the outline from the colors on layer B, now if I would do shadows on layer C I'd again have a third outline that's not completely finished, as you can see it all gets to a mess, when it could be real simple.
And I don't even know how I would animate all this when I have three different outlines on three different layers.
This whole Flash program takes a lot of time, more than I'm willing to invest, most of the time I'm spending on figuring out how to do very basic and simple things that I would have done in Photoshop within minutes. It should have taken me max an hour or two do a character instead it's taking me days.
I think I need to find some good video tutorials that show me how to do a comic animation in Flash.