Use payroll statements, the employment contract, the promotion letter and a duties description for each period to show one continuous year of qualifying employment abroad. Every part counted toward that year must be in a managerial, executive or specialized-knowledge capacity, and the proposed U.S. L-1A role must be primarily managerial or executive; an L-1A new-office beneficiary's qualifying foreign experience must itself be managerial or executive.
Build the chronology from documents that were created at the time
Collect the T4 and pay statements for the three years before the intended filing, the original employment contract and every amendment, and the letter or email that announced the promotion. Then prepare a table with one row per role: title, start and end dates, who the person reported to, who reported to them, and the main decisions they controlled. The table is a guide for the reviewer; the contemporaneous documents are the evidence.
Where a period of managerial work is claimed, add an organization chart from that period rather than a chart drawn today to fit the claim. If the company's records are thin because it is small, say so and use what exists: board minutes, signed supplier contracts, bank signing authority. Missing documents should be named in the file, not papered over with a broad declaration.