Data Modeler in SQL Developer

SQL Developer includes an integrated version of SQL Developer Data Modeler. You can create, open, import, and save a database design, and you can create, modify, and delete Data Modeler objects.

To display Data Modeler in the SQL Developer UI, click View, then Data Modeler, then Browser.

To create a new design, right-click the Designs node and select New Design.
To open an existing design, click File, then Data Modeler, then Open.

If the design is one that you have recently opened, you can click File, then Data Modeler, then Recent Designs and select the design.

To access other Data Modeler features (such as specifying design rules and user preferences), click Tools, then Data Modeler.

For information about using Data Modeler:

Use the online help: click Help or press the F1 key in the Data Modeler interface; or in the SQL Developer menus click Help, then Table of Contents, then look for the Data Modeler Concepts and Usage topic
See the Oracle SQL Developer Data Modeler User's Guide