回复：请教单身老猫

根據21 st Century Act of 2000 (AC21) 移民局容許對於即將到期的H1簽證，雇主每年可以為該顧員申請延長其有效期一年
H1B Extension. 然而您的情況可能是雇主為了省麻煩想走short cut. (老實說您應該諮詢專門處理移民是務的律師)
或是直接到移民局的辦公室查詢
(您的情況應該是簡單的transfer from A to B,而不是如此的做法，因為照理您的H1簽證還沒有滿6年，所以應該不需要一年一簽　
有關這方面的資料請同時參考下列資料


Difference between extension and revalidation You have to apply for H1B extension at the INS office, if your approved H1B is about to expire. If you have approved H1B and VISA on your passport is about to expire then you have to apply for revalidation at St.louis. (This is just revalidating your VISA, so that if you travel outside US, you can come to US using your valid VISA)

You must the application for an extension of stay BEFORE your current authorized stay expires. You must also keep your passport valid for your entire stay in the United States. Your employer should carefully read and file an INS Form I-129 (Petition for Nonimmigrant Worker) with supporting documentation to extend your H1B status.

While applying your H1B extension, please don't forget to apply H4 extension(s) for your dependents. Your dependents will NOT get automatic extension based on your H1B extension, so you have to apply separately for them.