If the group has 15 or more people, make the Group Appointment. If it is less than 15 people and you would still like to schedule your appointments at the same day and time, you can add fellow travelers as “dependents” when you complete your appointment request and the system will show times at which there are enough appointments available to accommodate you and your companions.
Read this link:
http://www.ustraveldocs.com/cn/cn-svc-groupappointment.asp
