Do not assume the original permission covers materially different work. Assess the proposed duties, entity and placement before relying on a schedule change.
Describe the alternative work accurately
Identify where it occurs, who controls it and what knowledge it requires. A project manager’s reassignment is a commercial instruction, not an immigration decision. The next activity must be supported by the appropriate authorization.
Keep the actual approval and status dates visible throughout, and do not treat a client delivery deadline as permission to begin work whose immigration basis has not actually been resolved. If the assignment is genuinely tied to a commissioning window, say so in the petition as the business reason for the transfer; a specific operational purpose strengthens the knowledge claim rather than weakening it. L-1B eligibility still depends on the related organizations, the worker’s required continuous year of qualifying employment abroad inside the applicable three-year lookback, and special or advanced company knowledge used in the assignment. When the beneficiary will be stationed primarily at an unaffiliated third-party site, the client must not principally control and supervise the beneficiary, and the placement must relate to a product or service requiring petitioner-specific specialized knowledge rather than supply labour for hire.