People who hold H1B jobs in the USA are permitted to work on a temporary basis for a specific period of time. The employer starts the application procedure for an H1B visa. This suggests that you must find employment in order for the corporation to sponsor your immigration to the US. If you are currently employed by employer A, you will need a job offer from employer B in the US in order to begin the visa process of H1B transfer jobs. You cannot transfer to another employer if you haven't gotten a job offer.