Thank you. I have been employed by the same petitioner for the last 6 years. I was in Chicago, but got unlucky with H1B draw for 3 consecutive years, and I transferred to Canada office under the same company in 2020. I initiated GC process in 2019 when I was still in Chicago when I failed my 2nd attempt for H1B. Once I go back to US, I will be employed by the same company. I'm not sure yet what the content of the offer letter will be. I need to talk to my lawyer whether I need an offer letter before I go to the interview, but I am assuming it will be an offer letter for the current position I'm holding, but just that the offer is from US headquarter. Hope this helps.