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<h2>Advanced report design</h2>
<h3>Linked querys</h3>
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<p>A subreport can have only a main dataset, but you can open as many datasets 
  as you want, and you can link this datasets to the main dataset or to other 
  dataset linked to the main dataset. You can also use the <a href="childsubreports.html">child 
  subreport</a> property of a section to merge subreports.</p