Llb degree holders from india do llm in us and work there permanently?

Your Indian law degree is irrelevant here. The US does not recognize foreign law degrees. You would need to go to law school here and then pass the bar exam. You would then need to find a law firm to hire you and sponsor you for a work visa, and that isn't going to happen with the tens of thousands of lawyers graduating each year from US law schools finding it hard to find work.