The pp is correct that you can book a ticketless package (room + DDP). With that said, however, unless things have recently changed, you can't just add the DDP to a RO reservation. If you want the package, the RO will have to be cancelled/refunded and a ticketless package booked, requiring a new $200 deposit (and the balance will be due 30 days prior to arrival). Since RO and packages are different reservation systems, money paid toward one cannot be applied to the other.
mickeynut1 is correct. Room plus dining (ticketless package) is a package reservation, so will require a $200 deposit and is subject to different terms and conditions than a room-only. You'll have to call WDW to book.
I've done ticketless package a couple of times. It's very straightforward to book, although you do have to call and it's not possible to price it out on the website. You get all the package goodies except for tickets, and you can always add the tickets.
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