How to Crop a Flash Movie

Using the “size” button, set a new height and width for the flash movie based on your flash design
At this point probably some of your movie images will be off of the stage
Unlock all layers
Click the “Edit Multiple Frames” button
It’s is just below the flash timeline
Click the “Modify Onion Markers” button and select “onion all”
It’s is the button is to the right of the “Edit Multiple Frames” button below the flash timeline
At this point the onion marker above the flash timeline should be across all frames of the flash movie
Click “View” > “Select All”
All the frames containing objects should appear selected

Now you can move your entire flash movie to where you want it in the new stage size.

This will keep all of the animation and tweens and layers in proper sequence and order, just like if you cropped the movie