From Word 7 Help
Use portrait and landscape orientation in the same document
1.Select the pages or paragraphs that you want to change to portrait or landscape orientation.
Note If you select some but not all of the text on a page to change to portrait or landscape orientation, Word places the selected text on its own page, and the surrounding text on separate pages.
2.On the Page Layout tab, in the Page Setup group, click Margins.
3.Click Custom Margins.
4.On the Margins tab, click Portrait or Landscape.
5.In the Apply to list, click Selected text.
Note Microsoft Word automatically inserts section breaks before and after the text that has the new page orientation. If your document is already divided into sections, you can click in a section (or select multiple sections), and then change the orientation for only the sections that you select.