if you mean "camera" then there's no built in camera class or functionality in flash (a weird overlook considering it started off as an animation program, a number of people have made animation tools or libraries for camera's, but it's easy enough to implement that it's not worth it to try and learn a library)
make sure you don't add children to the root or stage and instead add them all in one clip (I usually call it "game").
store your camera values (camx, camy, camrotation, camscalex, camscaley)
then you can make a matrix
var m:Matrix = new Matrix;
m.scale(1/camscalex, 1/camscaley)
m.rotate(-camr);
m.translate(-x, -y);
game.transformMatrix = m;
transformMatrix might not be the right property name, look it up on the livedocs to be sure
also i might have the matrix transformations backwards
livedocs:
http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/learn to love that site