Hi there, Brenda!
Happy to have you here at planDisney. I see you are just a few short days from arriving at the Happiest Place on Earth, so let's get right to your question!
You're going to love having Lightning Lane Multi Pass, especially since you are traveling with a large group. In short, your group will not need to stick together as you can select specific Guests to ride with you each time you make a Lightning Lane selection. With Multi Pass, you will not only maximize your time, but also allow for your group to plan and book attractions together as well as split off into smaller groups to personalize the magic.
Happy to walk you through a quick tutorial to make for a smooth entry once you arrive at the parks. When making your Lightning Lane selections in the Disneyland Mobile App, you will select the attraction and then be able to choose the Guests you are booking for from a list. Only Guests who are already linked to your account with a valid theme park ticket for that day will be visible. You will see a short cut to "select all", which would include everyone in your party, or you can curate your group if only a few Guests are looking to ride that particular attraction.
While not necessary, I'd recommend that each member of your party downloads the Disneyland Mobile App and links to each other to allow everyone the ability to make Lightning Lane selections for themselves or the larger group. To start, open the app and navigate to the three lines icon in the bottom right hand corner and select "My Tickets & Passes". From here, you can tap the "+" in the top right hand corner and select "Link Tickets & Passes". You will see three tabs at the top which reflect the three ways to link tickets:
TYPE ID: if you are looking to get your planning ducks in a row before your trip, this is your option to link ahead of time. You will need to do this separately for everyone in your party, but you can enter each of their ticket numbers here and you will be linked.
CAMERA: this is my preferred method as it's faster than a slide down Tiana's Bayou Adventure and can be done once you are all physically together. Tap "Open Camera" and simply scan the ticket barcode for the guest you are trying to link.
TAP: this is another fun option for anyone in your group that will be using MagicBand+. Open the "Tap" tab and select "Open Scanner to Link". Simply tap the MagicBand+ and poof! You are linked and good to go to jump into the magic.
One of the best perks of having the Lightning Lane Multi Pass is that you and your party will have unlimited access to all the Disney PhotoPass photos - including attraction photos! Don't be shy, I would hop in front of all the Disney PhotoPass photographers you stumble upon as it's a great way to remember the magic. You also don't have to stumble, you can actually find where the photographers are located in the app itself. Navigate to the upside down tear drop to head to the map. At the top, you will see a drop down menu where you can select "PhotoPass" and it will display all of their locations! My kids love exploring the Disney PhotoPass Lenses which offer fun animations, filters, and surprises while we wait in line!
Brenda, I hope you have the most magical day!
Tara