Can I be on US payroll while outside US after visa expires?

Your employer should discuss the payroll issue with a CPA.

Can I move back to old employer on L1 status?

Yes, if you still qualify per 1 out of past 3 years foreign employee requirement.

Do I have to file I-824 in order to attend a different consulate for my H1b visa interview?

If you had an H-1B stamp before, you may apply at another Consulate, however be prepared to travel to your home country if the application is not...

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L2 visa status to F1 visa

Yes, if the COS is timely filed.

Am I eligible to work or transfer my h-1 to a new employer when my work status is on H-1B ..RFE, that is pending, for decision

You have not provided sufficient information.

My physical stay on my H1-B is reaching 6 years. Can I stay 1 week more I have both visa and I-94 valid more than 6 years

There is no grace period

If I apply for a green card for my sister, will she still be able to travel to the US?

To visit you, she will have to show strong ties to home country else the I-130 hints to an immigrant intent.

Is there a chance that my F1 visa will be rejected as my visa interview is scheduled before my divorce finalizing date?

For F-1 visa, show strong ties to home country, availability of tuition funds and explain your interests to pursue a career in the field of your...

Where can I verify or see my current individual earned annual income to be put on form I-864?

Yes

My Mom has a B1/B2 valid for 5 years she came and stayed for 1 year " by extending the visa to another 6 months "

B-2 is visitor visa. She already stayed for one year and you wish her to visit you again for four months. It appears she is spending more time in...