What if h4 gets extended after h1 and COS approval??

You should not be filing both to extend your H4 and to change to H1b. If you do file for both, there certainly is a chance that you will not end...

Yes, you can start working for company B once you get the receipt.

I am the sister of the brothers with U.S. citizenship, where I visit them six months ago Do I have the right to seek asylum I'm

You can seek asylum if you are in danger of persecution based on race, religion, nationality, social group, or political opinion.

Can I use my tax documents to support that of my spouse as an F1 student filing for a green card change of status

Yes, if your employment is authorized.

How do I withdraw petition for AOS application?

Since she did not file for adjustment of status, he did, she cannot cancel it. She does not need to assist or attend the interview however, and...

There are no likely problems from the misspelling. Your employer should speak with an attorney about all of the remaining issues.

My wife filed an i-130 form for me. i would like to know if i enter and leave the US as i normally do or should i stay

You must indicate if your wife is a U.S. citizen, if you filed for adjustment of status and if not, why not, and if you applied for advance parole.

US Marriage petition

Do an infopass and request to know the status of your application.

Is there a problem for an e2 dependent (age 16) to apply to adjust status within 30 days of returning to US after a vacation

There is no such rule. If there were no representations made upon admission, there should be no issue.

I129 approved earlier now back to initial review

If your employer did not get a notice of approval, then the approval was revoked and they are reconsidering it. They may approve it again, or may...