I haven't done this myself, but I think what you'll need to do is include the info you want in the Properties of the document, and then insert the appropriate fields into the cover page and headers. For example, you'll fill in the Author in the document propoerties dialogue, and then insert the Author field where you want that to show up. You'll update the relevant info, therefore, in the Properties dialogue, and it will be automatically updated in the respective fields in the document.