3 drop down lists that are dependent on the previous box

Question

I am trying to make a page where there will be 3 drop down lists. the first box has 9 selections and depending on what you pick on the first box will determine what populates the second box, and that will determine what populates the third box. I've been able to get up to the second box, but I'm not sure how to code for the third box.

Answer 1

As you made the communication between the first and the second, you should be able to do between second and first ;)
Show us your code if you want more help ^^