There's not a plug and play form that's going to do that for you. You'll need to have something developed that uses SQL and your site's programming language, or Ajax, or JavaScript, depending upon where your data is stored and how you want to go about retrieving it.

If you tell us your actual need and a bit about your site, PHP, ASP, pure HTML, etc., someone can probably point you in a more clear direction.

Yes, this is a job for an AJAX-based design.

Essentially choosing an item from the first drop-down would trigger a JavaScript function which sends the data back to the server in the background, probably using something like JSON. The call to the server would also have a "callback" function specified.

The server would query a MySQL table with the value ("Chevy" in your example) and return it's response to the callback function on the page. The callback function would use JavaScript to update the 2nd drop-down box with the values retrieved from the server, without refreshing the page.

This process would continue until you reached the last drop-down menu.

If you are going to build something like this you could use a library like JQuery or MooTools to do all the heavy lifting. Once you understand how to build AJAX interfaces you won't find this to be too difficult, but as for a "simple code" it's not that likely - sorry!

Bill

Thanks guys, thought it was easier than that.
I wish I knew more about programming, sometimes I get lucky and figure out what I need but not this time!
I haven't decided if this is the route I want to go yet....seems like a lot of work.

It's not really that much work, here is an example using JQuery:

Auto-populating Select Boxes using jQuery & AJAX

Bill