Have you looked at Cathy's whitepapers at
http://msdn2.microsoft.com/en-us/library/ms965279.aspx
http://msdn2.microsoft.com/en-us/library/ms965281.aspx

>In the past I've always fudged multiple detail band reports by creating one combined table and added fields to denote which detail band a record should print in. I have a different situation now. I have two separate tables for each detail section. There could be multiple records in each but they really are both child tables. The report originally just printed the detail section based on the first table, but now I want to add a 2nd detail section from the 2nd table. I want the report to step through each table separately and print all of the records in table1 in detail band 1 BEFORE it starts to print all of the records in table 2 in detail band 2.
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>What I keep ending up with though is a record from table1 printing, then a record from table2, et al. all in the same section. I need separate sections really with a heading above both. I guess I need to do it the old way?