I believe the rule is not "60 + 10" days but just 10 days starting at 60 days out, e.g., arrival date plus up to 9 others. You need the Disney resort reservation put in your MyDisneyExperience account, and make reservations using that site (and you need a room reservation for any day you want to reserve a restaurant, i.e., to reserve all of 10 days requires a ten-day room reservation). Nevertheless , even then, sometimes it does not work correctly and you need to call.