If you want to book a split stay between your home resort and a non-home resort, at 11 months you should make a reservation at your home resort for the length of one part of the split and then when the 11 month window opens for the second part of the split, reserve at your home resort for that length of stay. Put different names as primary guest on each one so that MS doesn’t combine them automatically. At 7 months, modify one reservation to book (or waitlist) the non-home resort you want. That way, if at 7 months what you want Isn’t available (or your waitlist doesn’t come through), you can call MS to combine the two 11-month reservations into one continuous stay so that you won’t have to change rooms.