You should first ensure that the entity type which is to be the generalization, and the corresponding specialization category for the generalization actually exist (see Entity type: specializations/specialization categories).
- Choose Goto
in the screen Change Entity Type: Definition
Choose Generalization ® Create general... in the screen Maintain Generalizations. A dialog box Create Generalization is displayed.
Enter the name of the generalization under Entity type from and the number of the specialization category under Specializ. Cat. Press Continue.
The Change Generalization screen is displayed. Save the generalization here.