Editable Reusable Content
An editable reusable content item serves as an HTML code or content template that is formatted in one location but is not updated on individual pages when changed. The content owner will be able to change the Reusable Content item after they insert it on a page. This is useful if you want to define the proper form or HTML code for a block of content but you want authors to provide the content itself. For example, in a site that provides product descriptions, in which you want each description to follow a particular tabular form, you could create a generic Product Description Table item in the Reusable Content list, which authors could insert and then overwrite.
To make an editable reusable content item do not select the Automatic Update check box in the Reusable Content screen.