Drop down menu hierarchy and crap! ARGH!

So, i have been trying to make drop down menu buttons and i am moderately successful. I am using a book called FLash Advanced, for a class. and it is rather confusing.

This is what my menu looks like with all the buttons expanded.

Now, notice how there is two buttons under portfolio and then under visual their is print and web? how to i make it so that logically, when you roll over portfolio, visual and audio come up, but then you roll over visual and stuff “pops” out from the visual section.

I know you use movie clips. aside from that, i dont; know. is there a easy actionscripty way to do this? I want to also make the menu one clip and use it on multiple scenes. thank you anyone. … in advance.