When a content item is first created, you must select a site area to save the content item under. You can link content items to other site areas using the Link and Add Links buttons. You can also copy a content item to a different site area using the Copy button.
When choosing a site area to link a content item to, ensure that the site area you choose has a valid template map between the authoring template and presentation template you would like to use with the selected content item.