You can duplicate an offer by going to the Detail page of the offer you want to duplicate from and click the Duplicate Offer button:
Once clicked, you will be redirected to the newly create offer where you can edit the information.
The new offer will not carry over the following:
It will, however, carry over the following:
You can also duplicate an offer from othe Offer List Overview, by clicking on the Offer Name dropdown and click on the Duplicate Offer: