How do you designate a Custom Menu as the Page Menu in Atahualpa 3.6.4?

In Atahualpa 3.5.3 there was a place under Menus to designate a custom menu you create as either the Page Menu or the Category Menu. I don't see that option in Atahualpa 3.6.4. Was it removed? If so, how can you now designate a custom menu you create as the Page Menu in Atahualpa 3.6.4?

Using WordPress 3.1 and also have installed BuddyPress.

Many thanks!

it's always been in the 'dashboard->appearances->menu' settings
menu1 = ATO's page menu
menu2 = ATO's category menu

Thank you, Juggledad. Yes, it did show up once I started creating a custom menu. Apparently, it doesn't show until you actually start creating a custom menu.

Thanks!