http://www.ana.co.jp/wws/us/e/local/reservation/
"View Reservations/Purchases"
"AMC Members" or "Non Members" both work. You need ANA file locator, not the one on Aeroplan or AC.
I can change Aeroplan award seat assignments no problem, except for the domestic segment.
If you just log in through the regular AMC portal, you can't pull up reservations that are more than a couple months in the future.