My form has four sets of required fields, how to make the form submits even if just one set of required fields is filled

Hello,

I created an event registration form for an upcoming golf tournament.  (I uploaded a screen shot)

I used the Event Regisration Template.

My trouble is this: I have created a Golfer 1, Golfer 2, Golfer 3, and Golfer 4 information section.  Each applicant is suppose to fill out weather they are buying a Single Person ticket or a Foursome.  If they choose Single Person, we want them to just fill out Golfer 1 information, and not Golfer 2, 3, and 4.  But the form will not let a Single Person ticket buy fill out just Golfer 1, it makes them fill out all four sections before proceeding.

How can I redesign or set up the form so that this problem is corrected??

I appreciate the help, thank you.