1. Go to the Automation section in the sidebar navigation.
2. Then Choose Form Handlers on the drop down options.
3. Select the email Form handler that you'd like to duplicate.
4. Click the More dropdown button in the right hand corner, and click Duplicate Form Handler.
5. You will be routed to a page where you can make changes to the duplicated template. Once you're done editing, on the lower right part of the page click on Update Form Handler.