Hey Howdy Hey Rachel and welcome to planDisney!
Holy cow Rachel! You're only a few days away from your Magical vacation. I am a huge fan of split stays for our vacations. We love experiencing different resorts and enjoying each of their amenities and atmospheres. While both of the resorts you will be visiting are amazing, let's talk about your Lightning Lane situation.
Rachel, you are correct that if you have a stay booked at different locations on consecutive days at a Walt Disney World Resort, you should be able to purchase and book your
Lightning Lane Multi Pass for the whole trip. As long as your reservations are linked to your My Disney Experience account, this should happen seamlessly.
On the morning of your 7-day window opening, starting at 7:00 AM you can start purchasing and booking your Lightning Lane Multi Pass. You should see the option to do this for any day during your full trip. One tip I have for you is about any of your top "must-do" attractions. You might want to look to experience those closer to the end of your trip if possible. Less people will have the option to select times later in your vacation so you might have a better shot at getting your selections closer to the times you want and around any dining reservations.
I hope you can get all of your experiences booked perfectly so your Magical vacation will have just a touch more Magic before you arrive! Please let us know if you have any other questions, we are always happy to help!
To Infinity and Beyond,
Nick