On Sumdog there is no hierarchy between teachers and each can be in charge of multiple classes.
To manage which teachers are responsible for each class:
1) Click on Settings at the top
2) Click MANAGE in the Manage students box
3) To view all the classes in your school use the Class filter on the left and tick All grade/year groups.
4) Click the View details next to the class of which you would like to link a teacher
5) Click Select teachers
6) Check the box beside the teacher(s) you want to add
7) Save your changes.
If you would like to remove a teacher from a class just un-tick their name.
When you're linked to a class you'll be able to view reports, set activities, and assessments for them. You can monitor the class live from your teacher dashboard.