How to combine several Crystal reports in one PDF

Hello,

I need to generate 5 Crystal reports and combine them in one PDF file. Originally I wanted to create one report with these 5 reports as subreports then output it to PDF. This won't work, however, because each of these reports already has subreports, and reports within subreports are not supported.

I guess I need to output each report to PDF behind the scenes then use something like iTextSharp to combine these reports. I've found a few examples, but none of them is really applicable to my situation. I would appreciate any code example for this task.

Thank you.