You can drag tables from a database schema onto a database diagram, where they become accessible as offline database tables.
Another way of working with existing tables as offline tables is to import tables from a database schema to an offline schema. See Using Import with Filters.
To drag tables onto a database diagram:
You can drag more than one table onto a database diagram, by holding down the Ctrl key as you select them.
Note: If you have already imported the tables to an offline schema, that is the table definitions are already present in the Application Navigator or System Navigator, the table is created with a unique name.
Working with Offline Database Definitions
Creating Offline Database Definitions Based on Existing Objects
Modeler's Guide
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