Heigh-Ho Jason,
Welcome to planDisney, I am definitely happy to help with your question. Extending your Walt Disney World vacation sounds like a Practically Perfect plan. In fact, I am getting ready to modify one of my tickets for the same reason and it is easily done in your My Disney Experience profile.
Via your computer simply sign in to your My Disney Experience, scroll down to My Plans, Reservations and Tickets and select Tickets and Memory Maker. Under the ticket select Change Ticket, you will be prompted to add other tickets you would like to change at the next step. Next, choose the tickets you would like to modify, you can select up to 8 at a time. The next step will allow you to choose from the following options, Change Dates, Add Days and Upgrade Tickets. Don’t worry if you need to make multiple changes the next step will allow you to choose More Changes if you need to. Continue to follow the simple steps until you get to the final step which is payment. And Bibbidi Bobbidi Boo you have updated your tickets. After you are done be sure to make your additional Disney Park Pass reservations.
I hope this information was helpful and it sounds like you are getting ready for a Very Merry Magical and Memorable visit. Follow the
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Have a Practically Perfect Day,
Amy M.