L1 to H1B transfer with COS - doubt

Hi,

need your expert advice. I am planning to apply L1 to H1 (with COS) transfer under CAP this year. if I have to leave US while my H1B is pending for approval, how I can enter US with H1B status?

i) what will happen with my H1B application?

ii) do I need to apply for H1B from scratch (in CAP) again? or just need to go for stamping with the approved petition, before entering US?

iii) how long it normally takes in stamping from India, is there any risk in that process?

iv) is there any chance/possibility that my employer can withdraw/revoke my H1B application in that case?

Please advise