I agree with the pp to make sure the TA knows you don't want to lose the room discount before she makes the change. With that said, since you have a package without tickets, it's not as easy as just cancelling the DDP and making it RO. Since RO and packages are different reservation systems, money paid toward one cannot be applied to the other, so the package would have to be cancelled/refunded and RO booked, requiring a new deposit. There shouldn't be a problem making the change and keeping the discount as long as what you have booked is still available under the discount. However, if the promo you booked under is expired or the resort/room category you have booked is no longer available, there is a chance you could lose the discount. I'm not sure how it works for TA's and who they talk to when they call, but if a TA wasn't involved and you made the change yourself, you would have to talk to someone in guest services. CRO doesn't usually have the authority to check availability/modify a reservation with a promo if that promo is expired or the room type is no longer available, but guest services has a way of making that change without you losing the discount. I would maybe try to talk to the TA and explain what you want to do so there's no confusion. Good luck.