The formulation register and procedures with the chemist's authorship or sign-off, batch and quality records, training records, and a comparison of her knowledge with the rest of the workforce. Corporate and facility documents prove the relationship and the need.
Use the documents the plant already relies on
Hypothetical example: the company's quality manual lists the chemist as the approver of eleven of fourteen formulation procedures, and the batch archive shows her sign-off on the first production of each new product. Those two records, presented with an index, prove more than any narrative. Add the training log where she trained two junior technicians, the design notes she contributed to the U.S. blending line, and the technical director's statement explaining which knowledge is confidential and why it is not published. Include an organization chart of the technical staff with a note on who holds what. From the corporate side, the parent's shareholding in the subsidiary, both companies' financial statements and tax filings, the U.S. facility lease and the state registration. Confidential formulations may be described at a level sufficient to show specificity without disclosing the recipe; mark them confidential. The subsidiary files Form I-129 with the L supplement and pays the USCIS schedule fees.
Hypothetical example: a maker of ceramic kiln controllers seeks to move the technician who devised its fault-detection sequence to the U.S. affiliate. Version histories, restricted training materials, and the technician's troubleshooting logs identify knowledge that is specific to the enterprise rather than ordinary industry skill. Separately, payroll and role records must prove one qualifying year with the related company in the three years before filing or admission. L-1B time has a five-year maximum, so an evidence index should distinguish the intended temporary transfer from a permanent staffing plan.