You can start page numbering anywhere within the document.
To start page numbers with something other than 1, follow these steps.
Double-click in the header or footer area. This will open the Design tab under Header & Footer tools.
If your document doesn’t already have page numbers, click Page Number and the pick a location and style.If your document does already have page numbers, continue to the next step.
Click Page Number > Format Page Numbers.
In the Page Number Format dialog box, click Start at and type the number you want the document to start with.
Click Close Header and Footer or double-click anywhere outside the header or footer area.