1. Go to Configure and Document Types.
2. Select New.
3. Select the Project you want to copy the new form from:
4. Tick the form type
5. If you want to have the common user fields imported, place a tick in the box "Include Common User Fields". If ticked, this will push the common user fields over as normal user fields. If a common user field is retired in the source project but in use in the destination project it will not be retired, however if it is NOT in use in the destination project it will be retired.
6. Scroll to bottom and click on "Create Selected"