Through the center centre d'atenció a l'usuari you can request that you activate the official subgroups of your subject-group as Moodle groups. When requesting it, you must indicate the type of subgroup. If not indicated, all existing types for that subject will be created.
Once requested its activation, all existing subgroups of the requested type were created. Once created, the teachers will be responsible for the maintenance of the additions and deletions of the students in the subgroup.