1. In the Contact Builder app, click Data Extensions.
2. Select the data extension to copy.
3. Click in the data extension window.
4. Enter the name for the new data extension in the Name field.
5. Enter the external key for the new data extension in the External Key field. This value must differ from original data extension value.
6. Enter a description for the new data extension in the Description field.
7. To place the new data extension in a different location,click Change Location and select the new location. Otherwise, the new data extension exists in the same location as the original data extension.
8. Click Create Copy.