H4 applicant DS 160 and Visa Application for Drop Box when they have their own I 797 A document

USA H4 Visa
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Hi,

My Wife and Kid got their own I 797 A approval documents, They are going for Visa Drop box and I have below questions on DS 160 and visa Application filling.

IN DS -160 "

  1. We select the visa category as H1 and specify as SPOUSE OF AN H (H4)/CHILD OF AN H (H4)
    Question: What should I fill in “Principal Applicant Name” and “Application Receipt Number” for my wife and kid DS-160 document?

IN Visa Application:

  1. I Created an account for my wife and started the visa application.

    Question:
    a) What should in fill in the
    “Principal Applicant’s Name”
    “Principal Applicant’s Visa Class”
    “Petitioner’s Name” (in my wife and kid I 797 A document there no Petitioner
    name mentioned)
    “Receipt Number”
    b) Can i add my kid as dependent into my wife application ? (if I fill my kids
    DS_160 with her own I797 A number)

       c) If Ans to above question is no then i need to create a new login for my kid to fill the Visa Application?

It is very confusing as this is the first time i am filling the drop box applications for them.

Thanks in advance,

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