SQL Developer Data Modeler- Creating super/subtype relationship
The User's Guide does not tell you how to create super/subtype relationship.
To create super/subtype relationship in a logical model, you must already have the two candidate entities; one to be the supertype, the other subtype.
- on the logical model diagram, right click the candidate subtype and select Properties
- on the Entity Properties dialog box, select the candidate supertype from the Super Entity drop-down list, then OK
Depending on whether you enable or disable the Box-in-box Presentation on your logical diagram, the subtype would be shown inside or outside its supertype entity, respectively