I am able to do a 2 tier.  But when trying to create a 3 tier, I am having trouble.

I have one list called Risk Categories

There are 3 columns

Risk Category 1

Risk Category 2

Risk Category 3

The End User will choose a selection in Risk Category 1 first then from the item they choose it will drill down to more items to choose from in Risk Category 2 and even more in Risk Category 3.