Hi,
I think we can not do your scenario using check boxes.
My suggestion is use cascading drop downs Concept.
In this, we can populate the values to second drop down based on value
selected in first drop down.
I hope this will help for you.

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k.Ramana Reddy
http://www.GGKtech.com
> Hello,
> I have 3 check box that i would like to populate a drop down list when the
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> items that belongs to check box 3 in my drop down list.
> Hope someone can help.