The arbitrary groups would need to have a comps.xml file generated. https://fedoraproject.org/wiki/How_to_use_and_edit_comps.xml_for_package_groups https://fed

The arbitrary groups would need to have a comps.xml file generated. https://fedoraproject.org/wiki/How_to_use_and_edit_comps.xml_for_package_groups https://fedoraproject.org/wiki/How_to_use_and_edit_comps.xml... You can pass these to createrepo with the -g flag to create/update package groups in an YUM/DNF repository.