No. A recommendation may explain why the assignment is being proposed, but the specialized or advanced knowledge itself, and its connection to the proposed work, must be documented independently.
Convert a recommendation into evidence
Ask the person making the recommendation to identify the specific process, product knowledge, or project involved, then gather the underlying training and work records that actually demonstrate it, rather than treating the endorsement itself as sufficient.
The standard covers special knowledge of company products, services, research, equipment, techniques, management or other interests and their application in international markets, or advanced knowledge or expertise in company processes and procedures. A petition that says the transferee is a highly skilled welder with fifteen years of experience describes general trade skill and does not by itself establish L-1B eligibility. Skill that any seasoned grower could bring is general; knowledge of the company's own propagation protocol, developed and refined inside the organization, can be specialized. The qualifying foreign employment generally includes one continuous year during the three years before filing, while the L-1B standard asks a different question about the employee’s special or advanced organizational knowledge.