Multiple reports in one

Hi everyone,
i'm wondering if it's possible to create a report that include other existing reports and execute them like they were subreport.

Let me explain better:
Let's assume that I've 3 reports.
And suppose that I want a single PDF with the result of all 3 reports inside.
There's a way to create a new report that can execute the previous 3 reports like they were subreports, passing them specific parameters? or something similar?? :P

Actually I can accomplish this scheduling all involved reports and then merging pdf files with an application :/

I know, it's a strange question :P but it's more a curiosity that a real problem :D

Thanks ^_^