When you modify a template, the changes affect the new documents that you create based on the template. The content of existing documents is not affected by changes you make to the templates that the documents are based on.
On the File menu, click Open, and then locate and open the template that you want to modify. By default, templates (including Normal.dot) are stored in C:\Documents and Settings\user name \Application Data\Microsoft\Templates.
If no templates are listed in the Open dialog box, click the arrow next to the Files of type box below, and then click Document Templates (*.dot).
Change any of the template's text, graphics, styles, formatting, macros, AutoText entries, toolbars, menu settings, and shortcut keys.
On the Standardtoolbar, click Save .
Note: Microsoft Word updates the modified styles when you open an existing document only if the Automatically update document styles option is turned on. Set this option in a blank document, before you open an existing document, by clicking Templates and Add-Ins on the Tools menu.