Create two courses with shortnames Course1, Course2 and idnumbers C1, C2 respectively Create a .csv file with several groups following docs here: https://docs.moodle.org/33/en/Import_groups Login as admin/manager , go to one of the courses and open Participants > Groups > Import groups Import the file and make sure that everything is imported where it was supposed to be and there were no PHP notices or errors Repeat for a different csv file There were number of bugs in the group import code, here are some examples of CSV files but try to be creative and test different combinations (see commit message for the list of bugs fixed): groupname group1 group2 idnumber,groupname C1,group3 C-non-existing,group-will-not-be-created C1,group4 C2,group5 ,group6 coursename,groupname Course1,group7 C-non-existing,group-will-not-be-created Course1,group8 Course2,group9 ,group10 groupname,groupidnumber group11,G11 group12,G12