If you want to alter a style and make it available to other documents, but you don't want to permanently alter original styles in your document's template, create a new style.
Here's one way to do this: If you're creating a new heading style, select text with the heading style you want to alter, and make the formatting changes to it, such as a bigger font size, different style, and different color. Then, in the task pane, click the New Style button, and give this heading style a new name in the New Style dialog box. You'll find many of the same options here as in the Modify Style dialog box.
You'll practice creating a new style at the end of the lesson.
Tip Another way to create a new style is to click, in the document, in the actual style you want to build the new style on, and then click the New Style button. This opens the New Style dialog box, where you'd make all your changes.