It operates just like a regular repeating group, but with a slight twist. It allows you to edit more then one box to be repeated, including allowing a different content type to be selected for each box being edited in the repeating group.
-You select multi-repeating group
-Then you select how many boxes will repeat
-Third, you set a contact type for each
-Then, it displays the repeating group in the sequential order you set up with their corresponding content over and over again.
Because right now, you can only do a single box edit, with a single content type to be repeated over and over again, however many times you define it to repeat.