My H1B was sponsored by subsidiary A of XYZ group & later all computer professionals are made part of a new subsidiary B of XYZ group. Current H1B visa on my passport is with subsidiary A name. And the whole green card process has been with subsidiary B. My attorney says as per the INS rules, there is no need of a new H1B or update of existing H1B. He says all I need is a letter from B saying they accept all promises made by A. I am planning to take this letter & employment letter from B to CP interview. Please share your experiences and/or thoughts on this. Thanks.