I received a snail mail card with the PIN code you are talking about, I believe. I booked it online for the discount on the ROOM (40% off Deluxe). I then had the option to add tickets and a dining plan. The tickets and dining plan were full-price, and the discount did not apply to them. I booked everything as a package. Before I added tix and dining, the website read "Room Only Pinned Offer." As soon as I selected the tix, it said "Magic Your Way Pinned Offer", and when I added the
Disney Dining Plan, it said "Magic Your Way Plus Dining Pinned Offer." So unless a code SPECIFIES that it must be used for a Room Only Reservation, you may apply it to the ROOM portion of a package. Packages and Room Only are handled differently as far as deposit and cancellation, hence the necessary distinction.
If you cannot add the tix and dining to make a package online for some reason, you can always call to talk to a CM to learn the terms of your PIN code discount. Happy planning!!