I have H1B1(without visa stamp) and AP. I want back to China and try to get my H1 visa stamp. Just a little concern about visa stamp. (1)If I can't get H1 visa stamp and use AP to enter USA, could I still use my H1 to work for my current company? (2)If I can use H1 to work, could I extend that H1 for the 7th year? Thanks a lot