Certain changes may be made to instances on the stage that do not affect the main symbol. You may change the size, the rotation, the tint and the transparency level.
Start by dragging multiple instances of a symbol from the library to the stage. Then, select the Free Transform Tool. Move your mouse around the edge of the instance. You will see various mouse icons. Experiment with the changes you can make to each instance. For example, you can stretch, squish, skew and rotate the instance. None of these changes will change the main symbol. They will only change the selected instance. The main characteristics of the symbol remain, even when the original changes, the unique instances retain their own personality.