Hi Janine,
Yes, you can - so long as everyone is connected in your Family and Friends List in your My Disney Experience Profile. The
Planning with Family & Friends Guide on the Walt Disney World website explains how to do this in more detail.
Once you are all connected, you will be able to
make Advance Dining Reservations online and each time you do so, you will be asked to select all guests who will be attending the meal from your Family & Friends List.
The only thing to note is that if you, yourself, will not be attending the meal, you will need to select an Adult who will from your Friends & Family List as the Reservation Contact. (The only consequence of doing this is that only the Reservation Contact may cancel the reservation or update the dining party and once you leave that page, the name cannot be changed.)
Please also note that it will be your credit card which is used to guarantee those Advance Dining Reservations made by you (whether you will be in attendance, or not) so just be aware that if for some reason your friends party did not arrive as scheduled, your credit card would be charged.
I, myself, have made an Advance Dining Reservation for dinner at a Signature restaurant for my in-laws to enjoy on their own, during an upcoming stay. The rest of my family will be dining elsewhere on that particular evening. I didn't have any issues whatsoever in making both of these Advance Dining Reservations and can tell you that they both show up in my
My Disney Experience account.
Wishing you a magical trip filled with memories which will last a lifetime!
Emma