USA H1 and H4 drop box appointment applicant change

Hi, I have H1 and H4 visa drop box appointment in August 2023, but due to some problem I need to travel early in April 2023 and my dependents (Spouse and Child) will travel in August 2023.

What is the options applicable in this scenario?

1- Can I update the same appointment and remove my dependents details from this?
2 - Can I use the same DS160 and appointment and my dependents will be no show for drop box?
3 - Do I need to fill new DS 160 and take a new appointment just for my H1B stamping? In this case what will happen to the existing appointment which I have for H1 and 2 H4 stamping. Fees is already paid for three applicants.

Please advice.

I think you will need to cancel the existing appointment and book separately for you and your dependents and update the DS-160 one for you and another for your dependents. You should be able to reuse your visa fee reciepts.
You can also emai or call VFS to get theor guidance.

https://www.ustraveldocs.com/in/en/contact-us