Segundo a Microsoft, você pode conseguir isso seguindo estas instruções:
You can use different numbering formats in different parts of your document.
For example, maybe you want i, ii, iii numbering for the table of contents and introduction, and you want 1, 2, 3 numbering for the rest of the document, and then no page numbers for the index.
IMPORTANT: To use different numbering in different sections of your document, you need to make sure that the sections are not linked.
Click at the beginning of the page where you want to start, stop, or change the header, footer, or page numbering.
On the Page Layout tab, in the Page Setup group, click Breaks.
page setup group
Under Section Breaks, click Next Page.
On the page that follows the section break, double-click in the header area or the footer area (near the top of the page or near the bottom of the page).
This opens the Design tab under Header & Footer Tools.
On the Design tab, in the Navigation group, click Link to Previous to turn it off.
IMPORTANT: If your page number is in the header, be sure that you turn off linking for headers. If your page number is in the footer, be sure that you turn off linking for footers. Headers and footers are linked or unlinked separately.
Follow the instructions for adding page numbers or for adding a header and footer with a page number.
NOTE: Choose an alert and enter text here. You may also set it's AlertPosition property.
To choose a numbering format or the starting number, click Page Number in the Header & Footer group, click Format Page Numbers, click the format that you want and the Start at number that you want to use, and then click OK.
To return to the body of your document, click Close Header and Footer on the Design tab (under Header & Footer Tools).