You can organize the Groups in your school community by adding Sub-Groups to your community. The sub groups will have their own space. They can be seen in the left navigation tray under the groups label.

On Smart Phone app:

1. Tap on All Groups at the top left corner 
2. The left navigation tray opens up.
3. Click on the name of the community.
4. Click on Classes tab on the bottom
5. Click on +Class icon at the bottom right corner
6. Scroll down and click on Create a Sub-Group.
7. Enter all the details like Name of the Group, Description
8. Click on Create Group. 

The groups starts showing up in the Members tab of your community and in the left menu.