Don't know if it's the ONLY way but it's how I did it for our party of 11 last Nov. All I did was get the 16 digit ticket number for each of the other 9 staying off site, made them F&F and booked us all 60 days out. Never bothered with the invite thing. They were all family members so I gave my MDE user name and password to the adults so they could change theirs if they wished. Also, we two were at Board Walk on rented DVC points so I added my 2 adult daughters to our ressie at no extra cost allowing them to meet us there and park for free (at that time) and also park at the parks for free. As F&F they all got PhotoPass on our APs.
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