Transfer of H1B Visa valid - New Stamping after Transfer?

I hold valid H1B Visa from X company for A client. Now I have resigned from X company and joining new company.
Please suggest on how to proceed with the existing Visa, what is the process for transferring Visa issued by one company to another .

No need to transfer any visa. If you have H1B approval from new company, you can use your existing stamping to exit and re-enter until the validity. ReadH1B Transfer - Visa Stamping Needed ?