Hi,

I have L1 Visa from X Company on which I had already visited USA in 2008 for couple of months. This Visa is valid until Dec 2010.

I have H1B Visa from Y Company which is valid until Sept 2010. I haven't used my H1B Visa yet.

If I enter US with my L1 Visa now, will my H1B Visa be cancelled / revoked at Port of entry?
If I enter US without any issues, can I change from my L1 Visa to H1B Visa after a month?
If yes, what are the documents required for changing from L1 to H1B? I will not have pay stubs during my L1 Visa. I will just get my per diam. Please advise.

If I travel to US with my H1B Visa, do I have to face any issues at the port of entry since my H1B is valid only until Sept 2010?