You can also add new Fee Groups in USM as per your needs using Fee Module which is accessible under Menu Bar.

Step 1. Click on the Fee Module under the Menu Bar.

Step 2. Choose Fee Groups option from the sidebar on the left side of the screen. 

Step 3. Click on Add New Fee Group on the top left of the screen. 

Step 4. Fill the information asked about the group in the dialog box and then click on Save Changes.