To create a basic flow
- Open the Use Case Specification window and click the Use Case Scenario Sketch property group.
- In the Basic Flow area, click the Add new step button
or press Alt+ENTER and type a name of the basic flow step. Repeat this action for each basic flow step you need to create.
Steps of the basic flow are numbered automatically. Use the Up 
and Down 
buttons to change the order of steps. In the activity diagram, steps are represented according to their order in the Use Case scenario.