Cloning classes
If you want to make a copy of an existing class, that will include all the same devices already added, select the class from the class list table and click on the Clone button.
A new class will be added to the class list with the same name as the copied class and the word "copy" at the end. You can then add or remove devices from the copied class.
Deleting classes
Click on Classes and put a checkmark next to the class to delete. Finally, click the Delete button.