If you want to reuse an existing custom email in another event, you can copy the email's JSON source and paste it into a new email.
This guide walks you through the process step by step.
How to copy an email with a trigger
Navigate to the event that contains the email you want to copy.
Navigate to Custom Emails and click on "Edit" on the selected email.
Click on "Proceed"
Click Source Code → JSON Source.
Select all the text in the JSON source window.
Open the event where you want to add the duplicated email.
Navigate to Custom Emails - Create a New Email
Fill in the main email info from the page and click "Proceed"
Click Source Code → JSON Source.
Replace it with the copied JSON source from the original email.
The email will be copied.
How to copy a "Sent" email
Navigate to the event that contains the email you want to copy.
Duplicate the email
Navigate to "Edit"
Click on "Proceed"
Click Source Code → JSON Source.
Select all the text in the JSON source window.
Open the event where you want to add the duplicated email.
Navigate to Custom Emails - Create a New Email
Fill in the main email info from the page and click "Proceed"
Click Source Code → JSON Source.
Replace it with the copied JSON source from the original email.
The email will be copied.