Hello, Troy! Thanks for stopping by planDisney with your question!
I am so happy that you were able to take advantage of the
California Resident Ticket offer! It is such a great deal. Theme park reservation modifications are not available at this time, but you may cancel your current
theme park reservations and then make new ones. To view and cancel your current reservations, click the "Ticket and Reservation Details" under the "My Disneyland" menu on the Disneyland website and then follow the prompts to cancel. I would strongly recommend that you check the
theme park reservation availability calendar before cancelling and making new plans.
Keep in mind that with your California Resident Ticket you may visit the parks any three days before September 30, 2021, and those three days do not need to be consecutive. Also, if you purchased the Park Hopper tickets, you will make a reservation for the park you want to start at each day and then at 1:00 p.m., you can hop to the other park.
I hope this helps! Have a magical day!
-Linda