IN THIS GUIDE · Distinguish knowledge of a supplier’s product from the employer’s own procedures
Start with the L-1B eligibility and application overview
Identify the employer’s contribution
Hypothetical example: the employer developed internal procedures around a supplier’s equipment. Explain what is standard supplier instruction and what concerns the organization’s procedures. Do not attribute the supplier’s entire expertise to the applicant or assume a purchase contract proves a corporate affiliation.
Describe the nature and level of knowledge
L-1B can concern special product knowledge and international application or advanced knowledge of organizational processes and procedures. There is no universal requirement that the knowledge be secret or unique. Explain the actual basis rather than relying on a vendor certificate or the difficulty of replacing the employee.
Document acquired experience
Identify relevant internal projects, training and duties, including the applicant’s personal contribution. Separate knowledge acquired through the employer from expected future training. Prepare the qualifying foreign-employment history and entity relationship independently; a technical explanation cannot replace either requirement.
Connect the procedures to the proposed assignment
Identify the U.S. tasks that would use the documented knowledge and who directs the work. Clarify whether the applicant would serve the employer, a supplier or an unaffiliated customer in each arrangement. Have any relevant client-site restrictions assessed using the actual facts.
The document register tells you who wrote what
An employer that has genuinely built procedures around a supplier’s equipment usually holds a controlled document register: numbered procedures, revision dates, and a named author or approver for each version. That register answers the central question directly. Where the applicant appears as author or approver of revisions, the record shows a contribution to the employer’s own material rather than familiarity with a manual someone else wrote. Where every document traces back to the supplier’s published version with no internal revision at all, the file is describing product training. Pull the register before drafting any description of knowledge, because the description should follow the record. Redacting commercially sensitive content is normal and does not remove the value of a version history.
Read the supply agreement for what it forbids
Supplier contracts carry terms that shape what may be said and shown. Licence clauses may restrict use of the supplier’s materials, confidentiality provisions may limit disclosure to third parties, and some agreements assign ownership of derivative procedures to the supplier rather than to the employer. Each of those terms affects a file that intends to rely on internal documentation. Read the agreement before assembling exhibits, and where a clause bars disclosure, ask the employer to seek written consent or to prepare a summary that stays inside the permitted scope. Discovering a confidentiality restriction after documents have circulated creates a commercial problem on top of an immigration one, and neither is improved by that sequence. Ask which clauses survive termination as well, since an obligation that outlives the contract still binds the company relying on the documents.
Sources reviewed 2026-09-07. This guide covers a preparation focus; it is not an individual eligibility assessment.