# Adding or deleting sample data
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You can add sample data to entities in an App Studio application. Because application's don't communicate with external services until they are published, sample data can be used to test your application and entity in preview environments.

1. If necessary, navigate to the entity you want to edit.

1. Choose the **Sample data** tab.

1. To generate sample data, choose **Generate more sample data**.

1. To delete sample data, select the checkboxes of the data you want to delete, and press the Delete or Backspace key. Choose **Save** to save the changes.