Hi Eric,
It should indeed be possible to pass a parameter based on the input query of the data-driven subscription.
If you open that second link that I provided, then in Lesson 3 (
http://msdn.microsoft.com/en-us/library/ms169972.aspx),
at the bottom of that page is a little chapter called "
Specify a parameter value to vary report output". That's what you're after.
Of course in this tutorial it only makes any sense if you've read it from the beginning, while actually creating the report that they're talking about. But doing that it gives you a good idea of what is actually possible.
Regards,
Valentino
.