I applied for a B2 visa. My visa was stamped B1/B2. I travelled to the US a few times using my visa as a visitor. My company wanted to send me to the US on a business trip. Can I travel to US for a business trip with my visa? Will I face any problems at the port of entry?
According to the US consulate:
Most applicants applying for a nonimmigrant visas are visitors for business (B1) or tourism (B2). The two categories of visa are usually issued together as a B1/B2 visa.
In other words, as your visa is B1/B2, it allows you to visit the USA for both business and pleasure, however note that
"Business" does not mean gainful employment, but it does include a wide range of business-related activities (meetings, trainings, negotiations) for which you are not being paid in the United States. You may also seek medical treatment or travel as a domestic/personal employee.
That is, you can go on a business trip, but you are not allowed to work in the USA as a permanent employment location.
Here's a link to the US consulate in India, but the rules are the same in other countries.