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In the print dialog, select OmniPlan from the print options (where it normally says "Copies and Pages" or something similar). At that point you'll have control over whether or not a title, date, page number, and file name are printed above and below the main part of the printout, page layout, etc. The title is simply the name of the document. You'll also have the option to include or omit the outline portion of the document.