Assistance with Combo Box component

I am a student learning action scripting and maybe I bit off more than I can chew on this project for my class. I am trying to
1- populate a combo box component
2 - when the user selects from the box another combo box appears with secondary choices related to the first choice.

Is anyone willing to assist me in this code? I am open to IM anytime day or night or email. I have a good start, I am just having trouble piecing it together. Need someone who knows how it all works to help.

Thanks!