MagicDraw 18.3 Documentation
Make sure the selected Use Case has included or extending use cases.
To add a basic flow step from other use cases
Depending on your choice, the Select Included Use Case or Select Extending Use Case dialog opens.
5. In the opened dialog, select the use case(s) from which you want to add steps to the selected step of the basic flow. Click OK after you have selected a Use Case.
See the examples in the following figures.
Steps added from included or extending use cases are read-only, and you are not allowed to modify them in the current scenario.
You can modify added steps only in use cases from which these steps are added.