Have no idea you went to US several times for the past years. you must have a B1/2 VISA to do this buisness trip.
As a person with a valid B1/2 and no bad travel record, you are 100% qualified for a non-interview approvel to renew your visa, just ask the questioniry and give this information. At the end of the application, they just ask you to send your passport and photoes to a desitinated consulate, and cost two weeks you get your passport back with a new US B1/2 visa.
For people have never been to US, it's a nightmare now to make a visa interview. Generally more than 1 year waiting. But it's much friendly for people proven good visitors. You can do this even if your US visa has expired up to two years. Catch the opportunity. Or, is there any difference for Indian Nationals?