Hi...
I want my report to display records that match parameter X, but the users cannot just type in or pick the parameter from a dropdown, because there are thousands of possibilities. I want to give them a way of searching for or narrowing down a list until they find the desired value.
Does anybody have an idea of the best way to approach this using Reporting Services Cascading parameters Subreports Separate linked report Anything else
Thanks!!!

Selection Screen for Parameters?
Casey0001
First you need to understand the distinction between 'Report Parameters' and paramaters that your datasets require. They are two different things. You may have as many (or few) report parameters as you like and they don't have to map to dataset parameters.
So, you would create a bunch of report parameters, then setup dependences between them. This would allow users to narrow the parameters as the pick them.
Cheers
Paul