If my F1 is rejected, do i lose H1 also? If F1 is approved, can i come back on H1 and continue working till college starts?

[nss2010]

I am currently on H1B and have been accepted by college and received my i20. I am planning to travel back in May-April for stamping at US consulate at my home country. I want to continue working until the start of course. 
If my F1 is rejected, do i lose H1 also? 
If F1 is approved, can i come back on H1 and continue working until start of my college? If yes, how do i communicate to USCIS on when i would be starting my F1? would it be my last working day in current company? Would i need an entry stamp for F1

[JoeF]

Consulates often cancel other existing visas when applying for a new one.

If you enter on an H1 visa, you would have to leave the country and enter on an F1 visa to be in F1 status.

 

[Zharu]

On 5/13/2019 at 5:06 AM, nss2010 said:

I am currently on H1B and have been accepted by college and received my i20. I am planning to travel back in May-April for stamping at US consulate at my home country. I want to continue working until the start of course. 
If my F1 is rejected, do i lose H1 also? 
If F1 is approved, can i come back on H1 and continue working until start of my college? If yes, how do i communicate to USCIS on when i would be starting my F1? would it be my last working day in current company? Would i need an entry stamp for F1

Is your f1 visa approved? Am on the same boat now, going to attend visa interview to change my status from H1b to f1..