Droplists

Hi,

My question regarding droplists can be best undrestood through the xls file that i've attached.

I have 3 droplists and i want the 2nd one to present only some values regarding the choice made in List 1.

For example: if in the List 1 i choose B, in List 2 i only would like it to show me the values y, yy and yyy. And if i choose from List 2 the value yyy, List 3 should also present to the user the values i and ii.

Can anyone help me how to automate this?

THANKS!