Documents she produced or that depend on her: the written protocol with revision history, crop-cycle reports she authored, training materials and schedules, internal correspondence seeking her diagnosis and an organization chart showing how few people hold the same role.
Let the paper trail show who built the process
The strongest L-1B files are built from records that already existed before anyone thought about immigration. Start with the protocol itself, ideally with version dates and the grower's name on the revisions, and a short plain-language explanation of what makes it the company's own. Add the seasonal production reports that document the results and the adjustments she made, the training curriculum she uses for new staff and the time it takes them to become independent, and any messages in which the U.S. affiliate or other locations asked for her help. An organization chart and a list of employees by role show how concentrated the knowledge is. Employment records establish the continuous year abroad. A letter from the company president explaining the affiliate relationship, the assignment, the supervisor and the reason the U.S. site cannot simply hire a grower ties the exhibits together. Translations are required for any French-language documents, and each must be certified as complete and accurate.
Hypothetical example: A company that makes automated grain-sampling equipment wants to send the technician who configured its internal calibration library. The first review should produce an exhibit list: dated library versions, access controls, training records, service reports showing how the technician applied the settings, and an assignment plan linking those settings to the U.S. work. A letter saying the technician is indispensable cannot replace those records. If a customer site is involved, the contract must show the affiliate retains control of the technician’s work. Collect source documents before drafting; recreating a manual after the transfer plan begins invites questions about whether the knowledge was genuinely established.