Check the Ad/Master Ad/Campaign you want to duplicate. The checkbox can be found at the left of the table.
2. Click on Duplicate.
3. Choose on what Campaign and Master Ad to create the duplicate ad.
Please note that specific ads can only be created on Master Ad that doesn't have the same ad type. For example, if you want to duplicate 'New Traffic by Interests' ad to a different Master Ad, that can only be done if the target Master Ad doesn't have the same ad type (New Traffic by Interests).