I have a H4 dropbox confirmed appointment in December. I am in US and scheduled to travel next week. When we initially planned, I was only supposed to travel, so I just did my DS-160, made payment and booked appointment with great difficulty. Now I am planning take my 8 year old along. I have completed his DS-160 and made the Visa fee payment. So, do I need to book a separate slot for my 8year old like I did for myself? Or, as I have already a confirmed appointment for drop box, I can take his application alongwith me to the OFC and submit both the application?