From an HPE window, select the Subsystems menu,
hover over the Add submenu, then click on the type of subsystem you wish to add. The toolbar also has buttons
to add an Interface ,
or Low-level
subsystem.
This will open a dialog box prompting you for the new subsystem's properties. If you are adding a Low-level subsystem, you must
specify the interface to which it will belong from the drop box. Enter the name of your new subsystem and click OK.