Web Design - Edit a Library Item In a Dreamweaver 4/MX Document
If you frequently reuse page elements such as images, text, or other objects, then you'll want to store those items in libraries. You can create a library item from any element in the "body" section of a document. To edit a library item for a specific page after you've already added it to a document, you must first break the link between the item in the document and the library itself. To do so, select the desired library item in the current document and then click Detach From Original in the Properties inspector. When you do, the selected instance of the library item becomes blocked to updates when the original library item changes.