Add multiple fa files to a single AS3 class in Flash Professional

Question

I am making an animation in Flash professional and I need a constructor that can pick different movie clips that were converted from Fireworks. When I import the image in the Flash and convert it to a movie-clip and export to AS it requires a unique name. I want to have multiple images all into a single class is that possible?

When I go to edit the AS class it is basically empty

package  {

import flash.display.MovieClip;


public class fallingSymbol extends MovieClip {


    public function fallingSymbol() {
        // constructor code
    }
}

}

I want to add to the class and put the extra movie clips in but I am not sure if that is even an option. My attempt is below I created a blank class and cut and pasted the above in there. Doesn't seem to work.

package  {

import flash.display.MovieClip;

public class fallingSymbol {

    public function fallingSymbol() {
        // constructor code
    }


    public class Integral extends MovieClip {

        public function Integral() {
            // constructor code
        }
    }

    public class Multiplication extends MovieClip {


    public function Multiplication() {
        // constructor code
    }
}

}

} Any ideas?