You have to contact MS to bank the leftover 32 into the next UY. Then, you should use those 32 towards the next year's reservation first, then use from the new 150 and any leftover after that - bank to the following year. You must bank by the guidelines, because at certain times during your UY, only x amount of points are bankable. Once banked, they cannot come back or be borrowed into the current year. And if you do not use banked points by the end of the year they are banked into, they would be lost. And of course, if you forget to bank them, or wait too late into the UY - they would be lost unless you are able to rent them / use them by the end of the UY.