H1b Transfer if not travelled to USA

USA H1B Visa
1

My H1b stamped from company A and eligible to travel from 21st Sep

  1. How to transfer my visa from company A to company B
  2. Do i need to go for stamping again ?
  3. How much time it will take for this transfer ?
  4. If i start transfer process now …howcompany A will come to know about it
2

if you are interested in H1 Transfer .please email your updated reume at richa@aviglo.com