I found this thread

http://social.msdn.microsoft.com/Forums/en-US/sqlreportingservices/thread/d5fbd89f-44d8-4bb1-ad8d-f72925984f44/

but I don't know exatcly how to implement each steps.

I think it's stored in Reporting Services database.

Basically, I have some history reports for a single report.

I want to use these history reports as data source so that I can...