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而且我们旧的H1-B也还有2年多，请教Transfer和extension是一回事吗？
-Yes. You actually did not need to file H-4 extension at this time because your old H-4 was still valid for > two years. Your spouse H-1 transfer does not affect your old H-4 status validity. It seems the lawyer either is not experienced or just wants to get more money.

因为Notice写的是Application to extend/change nonimmigrant status.

再次谢谢！