From what I could determine, it looks like the only way to accomplish that is to dynamically create the query with the desired criteria. Pass-through queries cannot use parameters and they are parsed and run on the remote server. They don't have any knowledge of your local database and its forms.
Here's just one of the links I ran across that discusses it: http://www.pcreview.co.uk/forums/thread-1182381.php
You could probably create the query based on the update event from the combo box if you wanted to go that route.
Ezzaral
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