What you want to do is called Cascading Parameters and if you have a look at this article[/url] it'll explain it better than I can.
On two occasions I have been asked, "Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?" ... I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question.
—Charles Babbage, Passages from the Life of a Philosopher
How to post a question to get the most help http://www.sqlservercentral.com/articles/Best+Practices/61537