Once you have created your extension, simply define the entities exported by the extension. These entities allow you to use database tables that exist outside OutSystems.
To publish a new extension that contains entities, your OutSystems user must have the "Allow External Entities" permission. Check with the Service Center administrator for a list of your permissions.
To add an entity to your extension, do one of the following operations:
Add the entity manually to the extension.
Import the entity definition from a database, through the Import Entities from Database wizard.