Several of the members of the Colorful Yorkies.com site are members of this forum. Do you know how to do a YT search? You can find all the answers to your questions in many of the other threads right here. Just do a search for
Parti Carrier and many threads will open. You should be able to connect the breeders from the site you are referring to with members of YT that breed parti yorkies. Good luck with your adventure.