Before assigning student roll numbers, you can set the roll number prefix for a course. The prefix set for a course is then automatically applied to all batches  under that course and also applied to all students in each batch. The roll number prefix can contain a maximum of six alphanumeric characters.

At the top of your dashboard, click the module access icon >
Administration > Settings > Manage student roll numbers to open the Manage roll number  page.
  1. Click Set roll number prefix beside a course.


  1. Enter the roll number prefix.

  2. Click the Save button.

For more information, watch this-