Help With Form I-864

The form instructions will be able to answer your question.

Will change in job duties/industry after getting GC impact n-400 ?

you can apply for naturalization when you have completed the residence requirement.

Submission of supporting documents as part of RFE Response?

check with your employer's attorney working on the response. If USCIS accepts the new document, good. Otherwise you have to wonder whether there...

Will I loose my existing H1B status. If I close a pending Different case of I-485 applied through my citizen spouse?

H1b status is independent and does not end by close of marriage petition.

working and promoting a self owned business is employment.

Can I apply for US citizen since I had my green card through my USC mother in 1964 while I was 4moth of age and I left in 1970 ?

You could benefit from private consult to see if you either qualify for or have already acquired citizenship.

How can my illegal husband get an win number for taxes?

Did you mean tax identification, TIN, number?

Is it good to go for H1b stamping for first time ? while I-130 filed, ( Spouce based ) ?

I am assuming your spouse is permanent resident. Please seek legal advice for clear understanding.

What are the cap-exempt H1b employee options if the employer isn’t willing to sponsor green card?

You can complete your present H1b with your present employer and at the same time find a willing future employer to sponsor your greencard. You...

My ex-wife is asking for a baptismal certificate from my church to annul our religious wedding. Does this affect me?

You should not worry if divorce would affect your permanent residence. You can always seek legal advice to be clear.