MYW Package - upgrade child's ticket only?

[ouchgirl]

My family of 4 (2 adults, 2 children-3yr,6yr olds) are going to POP from 30 april to 7th may.
We've booked a MYW package with dining, with the 1 day park pass.

I have 2 x adult, 1 x child 5 day MYW base tickets from airmiles, so that I am still needing 1 pass for my kids.
Can I use only 1 of the child passes from the myw package and upgrade it to 5 days without using the other 1 day passes? Or should I just keep all those 1day passes intact for a future trip, and just get a separate 5 day ticket from Undercovertourist? I'd rather only have to pay $120 (than $184 for a 5 day ticket) to upgrade because it is less expensive but if it makes it too confusing for the hotel/pass card, I'd just get another ticket. I'm not sure how those hotel/key/parket ticket room card works so i just wanted to find out before I buy.

Thanks.

 

[CanadianGuy]

Yes.

You can book the package with just one day park passes just as you have done. Upon arrival at the world you can upgrade the one pass to whatever you need.

The tickets will be on the room key for each person.

Knox