Split testing a new landing page with website optimizer that needs new Ad

Hi,

Currently I am split testing 3 landing pages using website optimizer.
Now I want to test a completely new offer with a new landing page w/o disturbing the existing setup. But to test this new offer, I need to create a new ad. Also, I can't display the new ad for existing set up.How do I do that?

Here is simplified visual of current setup:

Set up 1
Keyword
|
Ad1
|
LP1 LP2 LP3

In new set up, Set up 2 :

Keyword
| |
Ad1 Ad2
| |
LP1 LP2 LP3 LP4

How do I go about this setup?Should I duplicate the entire campaign and modify ad and Dest URL for setup 2?

Thanks for your help!
Sonia.

Update :

Sorry, the visual is not getting saved correctly.

In the new setup:

ad1 is for LP1, LP2, LP3 and ad2 is for LP4.
All of this for the same keyword. Hope that clarifies the setup.

Thanks!