I came to USA from India through company1 on H1B. I worked for 4 years, quit and joined company2. After 1 year, i joined back company1 on a Sr. manager Role. Company1 applied for my GC. I have an approved i140 in EB3 category( 3 year of graduation in India). I am in a Sr manager role since past 6 years with Company1. Is it possible to change from EB3 to EB1. How can I do that?