By identifying qualifying special knowledge of the petitioner's products, services or other interests and their international application, or advanced knowledge of its processes and procedures. Internal or proprietary character may support the case but is not mandatory, and no U.S. labour-market test applies.
Internal, not simply difficult
Hypothetical example: The statutory concept turns on the knowledge belonging to the organisation, so difficulty and seniority are not the measure. A technician with exceptional command of manufacturer-published maintenance data is describing a skill the U.S. labour market can supply.
A technician who developed and maintains the company's own calibration sequence, validated over particular jobs and recorded in internal documentation, is describing something else. The petition should therefore be constructed around what the company itself created and around the evidence that it created it: authored documents, revision histories, internal approvals, project records. Where a role genuinely requires both layers, the file should describe the proprietary layer as the reason for the transfer and treat the general competence as background.
Presenting the two together tends to produce a description that reads as ordinary technical work performed to a high standard.