you would have a package vacation tied to your poly stay. You would have your dining and tickets attached to this. (I'm assuming you would have 10 day tickets?) Then you would have a room only ressie for WL. Your park tickets will carry over, but your dining will not
You would check in to the Poly and get your KTTW with dining credits. Your dining credits would expire at midnight the day you check out of the Poly, so you would have them your first night at WL. Then you would need to pay OOP for the food the rest of the week, unless you bought a one day tix for each person in your party to make the 2nd stay a "package" and you could get the
DDP again.. but not worth it.
When you check out of the poly you call someone to come get your bags. They will be waiting for you at WL later. Go have fun.. go check into WL later in the day. You might need new KTTW, or you can have your other ones recoded.
We did this last year (POFQ/Poly) and had little problems... it is the booking it that is confusing.