Flash CS4 Tutorial
How to Reuse Flash Symbols to Save Memory and Processor Resources
Reusing the same symbol several times is a great way to decrease your file sizes. For instance, you may have a wood fence with several fence boards in your scene. By creating a symbol for one of the boards, you can easily drag the board symbol to the stage and assemble the fence. If you wish to change the fence color, simply open the original symbol and change the fill color. All of the fence boards update to the new color.
Using the Pen tool (p key), draw a fence board shape on the stage.
Choose the Paint Bucket tool (k key) and fill the board with a color.
With the board selected, convert it to a Movie Symbol by pressing F8 ( Modify > Convert to Symbol ).
In the dialog box, name your symbol (board), choose Movie clip for the symbol type and leave the registration point in the upper left corner.
Option-drag (PC-Alt-drag) multiple times until you have five fence boards.
Double-click one of the boards to enter the symbol edit mode.
Change the board color and return to the main timeline by clicking the Scene icon. All of the boards are updated to the new color.