A subsystem is a package that contains the contents of the entire system or an entire model within the system. Dragging a Subsystem shape onto a drawing page automatically creates a new static structure diagram on a new drawing page. You can place elements that belong to the subsystem package onto the page to create a view.
Name a Subsystem shape and add other property values
Open the element's UML Properties dialog box by double-clicking the icon that represents the element in the tree view or the shape that represents the element in a diagram.
Control which property values display on a shape in a diagram by right-clicking the shape, and then clicking Shape Display Options. In the UML Shape Display Options dialog box, select and clear options to display or hide property values.
Control which property values display on the Subsystem shape
Right-click the shape, click Shape Display Options, and then select or clear options to show or hide values.
Create a diagram within a Subsystem shape
Right-click the shape, click Diagrams, click New, choose the type of diagram you want, and then click OK.
View diagrams contained in a Subsystem shape
Right-click the shape and click Diagrams.
Navigate to other views of the Subsystem shape
Right-click the shape, click Views, select the view you want, and then click OK.
Show, in a view, the relationships between the subsystem and other elements
Right-click the shape, and then click Show Relationships.