Thank you for the thorough description, however we're not sure we follow your scenario. If by any chance you have not checked this demo illustrating Crosstab item and drill down action functionality, please give it a look: Sales by Product Line per Period
. Please note how the ProductCategory textbox hides both the ProductSubCategory table group and the Total TextBox for it. The example can be found locally on your machine under C:\Program Files (x86)\Telerik\Reporting Q3 2012\Examples\CSharp\ReportLibrary\Crosstab.
If this does not solve your issue, please send us a runnable sample and explanations what should be or should be not shown and when.
the Telerik team
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