From the Design Studio, you can find and duplicate a landing page test group.
Right-click an unapproved page. Select Clone.
Give this cloned page a new Name. Cloned pages appear at the bottom of your current folder.
Now create a new test group by clicking New and picking New Test Group.
In the Create New Landing Pages dialog, enter the new test group Name.
At the bottom of the dialog, select the cloned pages in the Available Landing Pages list and click the arrow pointing right to include it in the Tested Landing Pages. Do this for all the landing pages you want in this group.
When you’re done, click Create.
When you’re ready to launch the test group, right click the group in the tree and pick Approve Test Group.
The group will now be actively tracking visits and form completions so that you can see which landing page is performing best.