lets draw one blue ball  in Frame1 one in blue starting from the left in layer 1 and make another layer2 and draw a red ball starting from the right like the one shown above. Now move to frame 20, hit F6 and in layer 1 using the shift key drag the blue ball and drag it to the right and in layer 2 using shift drag the red ball to the left.
We are trying to animate the blue to the right  and the red to the left. Now select both the layers and create a classic tween and test your movie, you will notice that the two balls and moving on either directions.
This is really helpful when you are creating a text using multiple classic tween.
Lets say we want  the letters BEST to drop on stage one at a time, so using the text tool type best on stage, since we want each letter to fall separately by itself we need to break each letter separately, we can do so by selecting all the letters and pressing Ctrl+B, having done this we need to take the ‘B’ separately the ‘E’ separately and so on to different layers, we can do so by selecting the entire text, and go to modify menu, timeline and distribute to layers. In your time line you will see that BEST each letter is distributed to separate layers as shown below.

You will notice in the above picture that the layer1 is also appearing, we may not need this layer, and you can delete this by selecting layer1 clicking on the trashcan below. Now lets go upto to frame 40, hit F6 to add a new keyframe, lets take frame 40 to be the ending keyframe where you want all the letters BEST to end up. Now let’s go letter by letter, first layer T click on the first keyframe and nudge the letter ‘T’ upwards like the one below, like wise do it for ‘S’ “E” and ‘B’ .

After you have done this click between frame 1 and frame 40 selecting all the layers and create a classic tween, and test you movie clip by pressing Ctrl+Enter.