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There is one approach listed in kettan's Cross-Join collection:
There's a related thread with his solution using this method here: http://community.tableau.com/thread/133862
You could also re-shape the data in Excel. There are several tools that can help with that, including:
There may be a way to get what you want strictly inside Tableau, but I'm not sure how off the top of my head.
Thanks Matthew. The Excel Add-in seems to be helpful for my purpose at first glance. I will try that.