Final Draft AV 2 does not have this capability. If you manually override the page numbers in the header, the same page number will show up on every page.
NOTE: Live support for Final Draft AV has been discontinued. You will still be able to install, activate and use AV on appropriate computers but email, chat and telephone support is no longer available. Live activation assistance will be available via phone (818-789-6281) and email and chat (links on the left side of this page) until June 14, 2017.