Dropbox appointment without primary applicant

We are planning to visit India to get the VISA stamped. We are eligible for the VISA dropbox.

If I paid fees and booked the dropbox appointment for 3 of us (1 H-1B and 2 H4) with a single profile and for some reason If I can’t travel to India, can that appointment slot be used for my both dependents for H4 VISA without my (primary) application?

If the answer is yes, how I’m going to use the fees paid for me for another appointment?