The L-1A and L-1B visas both facilitate intra company transfers but serve distinct functions. The L-1A visa is designated for executives and managers, requiring the transferee to assume a strategic or supervisory role in the U.S. entity. It allows a maximum stay of seven years. In contrast, the L-1B is intended for employees with specialized knowledge of proprietary processes, products, or expertise unique to the employer, granting a maximum stay of dive years. Both require the employee to have worked for foreign affiliate for at least one continuous year in the preceding three years, and both mandate a qualifying corporate relationship between the entities.