1. A method, implemented in a print shop system which includes a plurality of print job management programs each controlling a corresponding one of a plurality of print job processing devices, for using a pre-configured portable storage device to transport print jobs between the print job management programs, the method comprising: (a) a first print job management program detecting the portable storage device connected to a first print job processing device controlled by the first print job management program, wherein the portable storage device is pre-configured to contain a plurality of root directories, each root directory uniquely corresponding to one of the print job management programs of the print shop; and (b) in response to a first command from an operator, wherein the first command indicates one or more print jobs to be exported without indicating any storage location on the portable storage device, the first print job management program storing the indicated print jobs in the portable storage device under a first root directory which corresponds to the first print job management program.