You can't put a common MC inside 5 MCs in AS3?

Question

Simple question: In AS3 you can't do sharing of a MC between more MCs, right? In AS2, you can. How can I work around this?
Let me be specific: in ActionScript *TWO* I do something like this:
       movie.attachMovie(LargeImage, "image", 20);
LargeImage = movie clip of 400 x 480.
Now... the thing is: I do this for 20 MovieClips but they all REUSE the same original MC apparently (with no memory increase, of course). If I animate the MC, it will animate within all 20 MovieClips. I'm using a mask to show only portions of the MC, but I think that's not important.
But in ActionScript 3 this wouldn't work, right?
Because in AS3 every time we .addChild, the child is REMOVED from the parent, so the same MovieClip / Sprite couldn't be in 2 places at once.
How would you work around this without creating a separate instance of the "LargeImage" MovieClip for each object? Note that I don't want to use BitmapData & CopyPixels: the object may be animated.

Answer 1

AS2 does not use the same movie when you use the attachMovie method.  It creates a new instance of whatever movie is being attached from the library.
This works very similarly to what you do in AS3 when you declare a new instance of an object using its class name.  A new instance is created and then you use the addChild method to make it a child of whatever object you intend to...
var newInstance:ClassName = new ClassName();
movie1.addChild(newInstance);
you could also just use...
movie1.addChild(new ClassName());
movie2.addChild(new ClassName());
if you want to keep it to one line, though you lose the variable for targeting the object.  Still, since the object was the last added, you could target it using...
movie1.getChildAt(movie1.numChildren-1)