A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
So Debra's method works very well. If it is not working for you, it would be an indication that you have not implemented it properly.
at the link Vijay has pointed you to besides his solution which is similar to Debra's I believe, HanV cited three links to Debra's site:
http://www.contextures.com/xlDataVal02.html
http://www.contextures.com/xlDataVal13.html
http://www.contextures.com/xlDataVal15.html
the second two are other methods do have dependent dropdown lists
If you can't get it to work, you can click on my name (blue - hyperlink) and look at my profile. It will have my email address and you can send me a copy of your workbook. I can take a look and provide an example.
Or you can post your workbook on a sharing site and post the link then anyone that is interested can take a look.
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Regards,
Tom Ogilvy