Once you have set up the content for your offer management panels, it is easy to change the content itself if you have configured your scenarios appropriately. If the scenario is set up to retrieve content from a repository, and/or to retrieve content specified by the repository item name, then updating the content is simple. The new content just needs to be swapped into the repository or repository item.
This only applies if you are satisfied with the scenario itself and just want to change the content.