UML Modeling Techniques > Class modeling > Creating class modeling items > Creating a ternary association
  
Creating a ternary association
1. On the Class Diagram toolbar, click the Ternary Association button, and then click on the diagram in free space or within a Package.
If you click within a Package on the diagram, the Ternary Association is created as a child item of that Package.
2. Type the name of the Ternary Association, and then press the Enter key.