It looks like when I click on the on-demand subreport in preview mode, the subreport opens in a separate window. Is there a way to have it show within the main report?

>Yes. You can have on-demand subreports. They are discussed in the Crystal Reports help file.
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>>I have a report that has multiple subreports. What I would like to do is give the user the abiity to show/hide each subreport while previewing the report. Is this possible?