Using the --Link-- line as a job separator, multiple jobs can be specified in a single Gaussian input file.
Such a Multi-Job Gaussian Input file can be saved for two or more members of a molecule group by using "Yes, single file for all molecules" item of the "Save Molecule Group" combobox in the "Save Structure Files" dialog. For each selected molecule of the active molecule group, input for a Gaussian job corresponding to the molecule's current Gaussian calculation scheme will be written to the specified Gaussian input file.