If you want to use different page formats or headers/footers within the same document add section breaks to your document. This will allow you to set up different page formatting options (i.e. margins) or headers/footers from the rest of your document. To add section breaks click on the Page Layout Tab and the Breaks button under the Page Setup group. On the menu that appears you will see a heading for section breaks. Choose the section break option that best suits your needs.