How to get my B1 VISA converted to L1 VISA

I have a valid B1 VISA and been to US on it for training and technical discussions many times.

If I want it to get it converted to L1 VISA, is there a procedure to get it done?

No way to convert B1 to L1…

L1 Must be filed as a different visa by company, followed by stamping

B1 can be converted to L1. If you are working for same company for more than 3 years outside US and the company is willing to do COS. Check with your company’s immigration attorney