When you modify or create a style, you have the option to make it available to other documents. Just click the Add to template option in the Modify Style dialog box (you'll see this dialog box again, later in the lesson).
Switching the focus solely to styles: Before we talk about how to modify a style, we should mention templates. Any time you change a style or create a new style, you have the option of adding your changes to the document's template.
What's the template?
The template is the file whose styles your document is based on. It exists as a separate file that works in tandem with the document—but it stays in the background.
For example, if you click the New, Blank Document button , you get a blank document to type in (a .doc file); all the default formatting for it, though, is dictated by its template, normal.dot (the .dot file extension is for templates).
Save style changes to the template
If you save style changes to the template, the modified style is permanently changed for all documents that use this template. So, for example, if you change the point size of a Heading 3 from 13 to 10 and you save the change to the template, which is normal.dot, every time you open a blank document, your Heading 3 will have the smaller point size.
Don't save style changes to the template
If you don't save the change to the template, the modified style is saved only to the current document.
In the practice session, you'll see how to save changes to the template and how to see what template your document is based on.