The Subsystems command enables you to create a Subsystem or work on an existing Subsystem by means of the Subsystem Selector.
You can create Subsystems using this selector but you would usually only create the top-level Subsystems in this way. Lower-level Subsystems are usually created in the chart or text of the parent Subsystem.
You can select an object by typing its name in the Enter name field. If the object does not already exist you are asked if you want to create it. Wild cards are allowed in this field. Alternatively, click on List All and then scroll through the list until you find the object you want. Click on the name to select it.
A selected object is shown in reverse video (highlighted). You may highlight more than one object if required. Pop up the selector menu and choose an operation. Some commands are not available if you have highlighted more than one object.