...
- The next step is to create as many versions of the original email. To do this, select the original email on the Email tab under Saved and click on create a copy from the actions drop down. Once you have created a copy of the message, go ahead and make the changes to that email. For example, your first version may have a different subject line. Continue to create as many copies of the original email for each change.
Tip It is recommended that you change only one variable (e.g. subject line, images, text, etc) per email so that you can accurately track its result.
...
How to Create a New A/B Test
...