In order to repurpose a campaign or promotion you may first rename the desired a promotion no longer being used. In order to rename a promotion the user must lick on 'Customize' next to the promotion name.
Click on the pencil icon next to the promotion name on the following screen.
To edit the existing campaign name, click on list of campaigns on the drop down menu.
Look for the desired campaign and rename the campaign by clicking on the pencil icon.