https://www.uscis.gov/sites/default/files/document/foia/Noni...

Can a nonimmigrant in H-1B or L-1 status intend to immigrate permanently to the U.S.?

Nonimmigrants in H-1B or L-1 status can be the beneficiary of an immigrant visa petition, apply for adjustment of status, or take other steps toward Lawful Permanent Resident status without affecting their status. This is known as "dual intent" and has been recognized in immigration law since passage of the Immigration Act of 1990. During the time that the application for LPR status is pending, a nonimmigrant in valid H-1B or L-1 status may travel on his or her visa rather than obtaining advance parole or requesting other advance permission from USCIS to return to the U.S.