The Student Groups screen provides an overview of student groups in UniTime. If a student group has an external id, it cannot be edited in UniTime.
The table of student groups contains the following information
Id of the student group as used outside UniTime
Code or abbreviation of the student group name
Name of the student group
Number of students in the student group
Clicking on any of the student groups takes you to the Edit Student Group screen where you can edit that particular group.