Booking different Fastpasses (FPP) for members of party

I am looking for some information on how to book different fastpasses for my party of 6. For example, in Epcot, all 6 of us want to do 2 of the same FPP attractions. However, for the third one, 3 of us want a FPP for Soarin, and the other 3 want a FPP for Test Track. How do I go about booking all 4 of these FPP for the correct people? From the beginning, do I select that I am making the reservations for all 6 of us or do I only select 3 people at a time, and then go back through and do the other 3 people?

After the original chives have been made, yo an circle back and change to anything available using the APP.