From your User Settings, click on Subsystems. The default is labeled System.
To create a subsystem, click on +Create Subsystem. You can add the subsystem name and set its color. When you are done, hit Save.
To edit or delete, click on the Edit button. You can either update the name and color or delete the subsystem.
If you have any questions, you can reach us through the chat or email us at email@example.com.