If you’re working on a long document and want parts of the document to have Landscape page setup, you can do so by following the steps outlined below:

1. Separate the sections that you want to apply different Page Setups to need to be separated by a Next Page Section Break. You can apply a Next Page Section Break by choosing Insert | Break from the menu bar and clicking on the Next Page option button under the Section Break Types panel of the Break dialog box. (In 2007, select the Page Layout tab, then choose Breaks | Next Page in the Page Setup area.)
2. Select the text/pages you want in Landscape/Portrait and choose File | Page Setup from the menu bar. (In 2007, remain on the Page Layout tab, and in the Page Setup area, click on the Orientation button.)
3. Choose the orientation you want and then in the Apply To dropdown box, choose Selected Text.
   This will create a document partially formatted using Portrait orientation and partially using Landscape orientation.