Sub systems are added, to the digital twin, upon request to the frontline.io team. They are defined by the customer and enable you to "break down" or categorize your digital twin model in the best way it suits your company.
After clicking on sub systems in the left panel, a right panel will open with a list of the digital twins sub systems. A sub system is activated by pressing the power button near its title. You can easily skip between sub systems. A sub system doesn't have to be defined as a specific part or parts, but can even be defined as a certain state the digital twin should be in (e.g- x-rayed, animation on, etc.).