Create and Place Movie Clips in Flash CS5
In Adobe Flash Creative Suite 5, movie clips are created as new, empty symbols as well as from existing content on the Flash CS5 stage. If you create a movie clip from scratch, you can add animation and graphics later by editing the symbol.
Follow these steps to create a movie clip from existing graphics:
Create some interesting graphics on the stage by using the drawing tools.
Select the new artwork and choose Modify→Convert to Symbol.
The Convert to Symbol dialog box appears.
Enter a name for your new movie clip in the Name text box, choose Movie Clip from the Type drop-down list, select a Folder (if it’s other than the main Library root), and click OK.
The artwork now appears as a movie clip on the stage.
Choose Window→Library to check out your new symbol in the library with a special Movie Clip icon next to it.
Nonanimated graphics converted to movie clips behave the same as graphic symbols, so you can place, tween, and modify instances on the stage. The difference, however, is that you can always add animated content later to the movie clip by editing it and creating tweens on its own Timeline.
In most cases, you take full advantage of movie clips by adding animation in a new movie clip symbol. To do so, you can start with a new, empty movie clip symbol and add the animated content afterward.