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http://support.microsoft.com/kb/328320
If you have only one or two "options" - i.e. you have a crosstab with 5, 10 or 15 columns - you may find it easier to just create the 3 crosstabs and be done with it. If you think you'll have more down the road, of if the number of columns is very dynamic, then the article should show you how to get started.