Byte array of PDF as instanceReportSource

Hi,

 Is there any way to use Byte array (which I convert from PDF) as an instanceReportSource? 

 Here is my scenario, I need to generate TWO report, say Report A and Report B. Report A is a subset of report B. Report A is generated first (at the beginning of the business cycle), then saved as byte array (in the database). then at the end of the business cycle, I need to generate Report B, which half top of it is exactly a copy of Report A. How can i achieve this using the byte array off Report A i already have?

Thanks & Regards,

Rafa