1. After you have inserted the Section Break, place your insertion point on the first page of your new section.
2. Click View on the menu bar and choose Header and Footer.
3. Then place your cursor in the header or footer that you want to edit. You will see "Same as Previous" displayed on the header/footer border (dotted line that surrounds the header or footer). You need to turn this option OFF so that you can create a new header and footer that is not linked to the previous section. To turn it off, click on the Link to Previous button on the Header and Footer toolbar. The button should no longer be highlighted and you should no longer see the words "Same as Previous" on the dotted border. With this feature turned off, you can now modify your header and/or footer without it affecting other sections of the document.

click to enlarge