Confirm actual permission and the complete arrangement before work.
Keep separate proposals separate
A pending review of one assignment does not authorize another. Assess its employer, knowledge, supervision and purpose on the real facts.
The date the qualifying year abroad is complete, how quickly the foreign affiliate can produce employment records, and how long managers take to describe the knowledge in usable detail. Assemble a simple timeline of employer entity and location for the past several years and have it reviewed before anyone plans around a start date. The safer sequence is to complete the specialized-knowledge evidence, file the petition, and schedule the vendor test after approval and admission in L-1B. Changed duties, supervision or placement terms may require a different assessment or additional steps. If the qualifying year abroad is complete and the specialized-knowledge account already stands on its own, a further posting adds delay and a fresh set of dates to reconcile. Do not use a customer delivery deadline as permission to start an assignment whose immigration basis remains unresolved.