L1B to H1B Question

l1h1user

Registered Users (C)
I am on L1B for company A and this is valid for one more year. I am in US currently.

I applied for H1B Change of Status through company B.

1. How long can I continue to work for "company A" after the H1B approval?
2. After H1B is approved in "company B" can "Company A" apply for H1B transfer?
3. Mean while Can I continue to work on my L1B for "company A" and then after the H1B Transfer is approved can I work for "Company A" on H1B?
4. From when can I work on this Transferred H1?

Thanks for your answers.
 
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