Package vs room only

This is my first time planning a disney trip and i am still a little confused on pkg vs room only. I want to stay at poly. If a room discount becomes available later this year for my travel time can i change my reservation to a discounted room even if i book it as a package or can i only change it if i have room only reservations?

You can call to add on any discounts that come up and are applicable to your resort and dates/length of stay. Those can be package or room only.