I currently have a ticketless package so i know it can be done. You do need to call as it is not available to book online. Not sure how it works with 3rd party bookings because they basically have to cancel the room only res and rebook as a package. If you had a room only discount on a Disney booked reservation, the savings for the discount will be transferred to the package. Again, not sure how that works with 3rd party bookings as I have only ever booked room only dorect with Disney. All package stuff applies such as being paid in full by 45 days, $200 deposit, etc... You also get all the special perks like Disneyquest admission, minigolf vouchers, discount coupons, etc...