I think you mean a modification. A new reservation would only be needed if you were keeping the current resort and adding another resort. ie split stay.
Depends on what you want to do. If you are at POP but want to change that to a stay at POR, then it's a modification. But, if you're at POP and want to stay at POR after several days at POP, it will be two different reservations.
Our Authorized Disney Vacation Planners are here to provide personalized, expert advice, answer every question, and uncover the best discounts.
Let Dreams Unlimited Travel take care of all the details, so you can sit back, relax, and enjoy a stress-free vacation.