Sometimes in long documents you might want to vary the page layout or change the headers to reflect new headings in major sections of the text. When you want to change the layout or create new headers or footers for another part of your document, you can insert a section break to instruct Word to stop carrying the formatting forward at that point. You might add section breaks before the beginning of each new chapter in a book manuscript, for example, or add breaks in a report in which you need to change from portrait orientation to landscape orientation.
Click at the point in the document where you want to begin a new section.
Click the Page Layout tab.
Choose the Breaks arrow.
A list appears, ...