UML Modeling Techniques > Activity modeling > Activity diagrams > Creating an activity diagram
  
Creating an activity diagram
Right-click the Activity that is to own the Activity Diagram, point to New, and then click Activity Diagram.
When the UML Profile is present in the Model, you can create an Activity Diagram from an Actor, Class or Use Case (Modeler creates an Activity to own the Activity Diagram):
Right-click a Actor, Class the Use Case, point to New, point to UML, and then click Activity Diagram (via Activity).
Modeler creates a Frame on the Activity Diagram that is linked to the owning Activity.
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When you create an Activity from a Class or Interface, Modeler also creates an Activity Diagram as a child of the new Activity.