A Non-CIMT and/or petty offense, alone, should not affect your admissibility to the US.

Am I eligible for B1 visa based on contract between American Co. and Serbian company that I work for. How about H2B visa?

Each visa has completely different requirements and limitations. Consult with an immigration attorney to find the most appropriate fit.

Clues are available at the office of the nearest experienced immigration attorney's office in NYC.

Am I eligible for B1 visa based on contract between American Co. and Serbian company that I work for. How about H2B visa?

Consult with an experienced employment-based immigration attorney.

Please let me know if Section 245(a) of the INS is still active if an alien who is here in US legally using a non-immigrant visa

If the person is maintaining nonimmigrant status, 245(i) is unnecessary for adjustment of status; whether grandfathered or not.

My wife completed a ds-260 with a few errors, Can the interview officer at the emabassy in india fix her errors in the system?

Clerical errors can always be resolved at the interview.

Does a class B TB affect I-485 decision

TB is a communicable disease that can give rise to inadmissibility if untreated.

Traveling to US Territories with DACA?

Yes, you can travel domestically within the US as a DACA beneficiary. Note that you must obtain an advance parole travel document for any travel...

The H-4 change of status should take care of the previous H-1B status.

How do i go about getting a residence visa?

You must petition her for permanent resident status. You may have issues adjusting status if she came into the US as a tourist but was already...