You can create a GPF (Generic Program Format) file using a text editor, by exporting data from PartMaker or by using another CAD/CAM program.
The most common uses for GPF files are:
Importing and exporting GPF files
Use the File > Export > GPF File menu option to create a gpf file that contains all groups of part features in the active Face window.
Use the File > Import > GPF File menu option to merge (attach) all groups of part features from a gpf file to the list of groups in the active Face window.