Use Quick Doc Merge
Quick Doc Merge allows you to merge multiple files or jobs together so they can be printed as a single job on the Fiery server.
Documents to be merged must be either PostScript or PDF format. When merged into one job on the Fiery server, the job becomes VDP format.
A Quick Doc Merge job overwrites all print option settings for the individual documents to the Fiery server default settings. Therefore, you must set the print option settings after you combine the separate documents into the single Quick Doc Merge job.