I am a Chinese citizen holding B1/B2 visa which will expire in 2022. I have entered US multiple time for leisure. I am a landed immigrant in Canada and hired by a Canadian accounting firm. My firm is engaged to perform an audit for a US company based in Florida. The partner wants to send me to US for this engagement. The work (ex. meeting with client, examine financial record...)will last around two weeks. Can I enter US with B1 to perform this work? Do I need to provide any other supporting material while going through US customs?
Thanks for your help:)