In a use case diagram, the extends relationship between two use cases indicates that an instance of use case B, subject to conditions specified in the extension, can include the behavior specified by use case A. The arrowhead in the Extends relationship shape points toward the base use case, not toward the extension.
Name an extends relationship 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 are displayed on the extends relationship
Right-click the shape, click Shape Display Options, and then select or clear options to show or hide values.
Navigate to other views of an extends relationship
Right-click the shape, click Views, select the view you want, and then click OK.