I140 approved H1 transfer and vising India

Hello,

in the past you have answered my couple of questions, I need one more suggestion from you.



 



When I came to USA on H1 visa it is valid until 2012 through A, after that based on my approved I-140 my H1 extended and valid until 2016.



1) Now I got better job so planning to move to company B. At the same time after joining company B, I am planning to visit India. What will happen to my approved I140 from company A? Company B will only apply my Green card after 1 year of employment.



2) When I visit India how long will i get my H1 visa?  Can i use approved I-140 from my Company A for stamping?



Please provide me guidance.



 



Thanks,



Joe.



 



Thanks,



Joe.