title: Add Subreport to a Crosstab main report in Crystal Reports
body: <p>I'm working on a project that specifically requieres a crosstab in the main report (variable amount of columns), in which, as crossed values, I've got the result of a sum.</p>
  
  <p>But I need to display the details of such sum. I'm not using BusinessObject Enterprise, so there is no chance of linking to another report, and I can't drill-down on it, so the only way around seems to be the use of subreports.</p>