MDE? Linking 2 parties travelling together

[I Run Long]

We are headed down again this year - woo hoo! Cast of characters are: Me, DH, DS18, DD16 and my DH's DD, DH, DS12, DS9 - so 8 people in all. We each have our own reservations: 5 days at POR and then 9 days at SSR (each in a 1 bedroom). Since we are two parties but we want to do things together such as dining and Fast Pass+ - is there a way to link everything through MDE? I'm registered on MDE along with our resort reservations - haven't added anything else yet as it it too early to do so (we're headed down in August). This is my DH's DD and family's first trip to the World - so they are babes in the woods with this. I'm trying to make this as easy as possible for them. TIA!