where formatname is the name of a GenFormat formatting routine that you have created. To create a format, see Creating a Format.
This option specifies the name of a formatting procedure, which is an entry point in a tailored support library or in the default Support Library. Snapshot calls the format in the tailored support library or the default Support Library for each data set record. Your entry for “SUPPORT” determines which library Snapshot calls.
If you use FIXEDFORMAT (or a similar format), you might want to set the DATACHECK format option to FALSE for improved performance. See FORMAT Options