If I make a reservation for 20 days but later would like it to be 2 or 3 reservation numbers can it be changed?
This is what I think
is the answer: it depends. If you have a status level that would allow you to make a one day reservation at 13 months out, then Yes, you can ask the VOA to have Technical Support modify your reservation to break up, or reduce your reservation.
If you are not eligible for less than 7 day reservations at the time of the reservation, and you subsequently try to modify your reservation to something you would not have been able to do at the time of reservation (like make your 20 day into a 7, a 7 and a 6) then you won't be able to do that, because you wouldn't have been able to initially make a 6 day reservation.
do not know what would happen if you tried to make a 20 day reservation 13 months out, and then tried to drop the front of the reservation, effectively jumping the line on the latter part of the reservation.
Good luck and I hope whatever you are trying to do works out!