Hiya, Anne!
I think it's great that you are adding even more magic to your planned visit to the Disneyland Resort. To bring along another Guest with you to The Happiest Place on Earth, I recommend keeping your existing
theme park reservations and making a new
theme park ticket purchase and park reservation for the additional Guest you are bringing along. If you used the same Disneyland Resort account for the ticket purchases, all the tickets will already be automatically included in the "Tickets and Passes" section of the
Disneyland mobile app. You will likely end up with multiple theme park reservation confirmations. But that is OK. As long as each Guest has both valid theme park admission and a theme park reservation for the same park, you are all good to enjoy your visit together!
Tony’s Tip: Even when theme park tickets are purchased separately and have separately-booked theme park reservations, they may all be linked to the same account for purposes of enjoying the
Disney Genie+ service together. For tickets that aren’t already linked automatically in the Disneyland app, you may visit the "Tickets and Passes" screen to link them. If the "Link Tickets and Passes" button isn't showing, tap the '+' button in the upper right-hand corner of the screen.
I hope you have a magical time at the Disneyland Resort, Anne!
~Tony