The knowledge has to attach to the petitioning company — its own product, service, research, equipment, techniques or procedures, and how those apply in international markets — or be an advanced level of knowledge of that organization’s processes. Excellence in a widely practised skill, however rare the practitioner, is not the same thing.
Advanced within the company, not the field
A useful diagnostic is to ask what a competent new hire from a competitor would still not know after a month. If the answer is nothing much, the knowledge belongs to the trade. If the answer names things only this organization does — a formulation it developed, a control sequence it wrote, a customer-specific method it maintains — the petition has something to describe. The second half of the diagnostic is availability: how many people in the company hold this knowledge, and could one of them be sent instead. A truthful answer of four is not fatal, but it shapes how the case is presented.
Hypothetical example: a finishing-line technician near Roxton Pond is proposed for transfer on the strength of his mastery of an ultraviolet-cured coating system. The coating is sold by a chemical supplier to buyers across the sector, and the supplier trains operators on it. His real distinguishing knowledge, if there is any, is what this employer does with the system that others do not — the schedules developed in house, the tolerances established for particular species and grades, the failure modes documented over several years. That is the material the petition should be built from, and it should be evidenced by records rather than by adjectives.