Evidence of the qualifying corporate relationship, of one continuous qualifying year with the group abroad within the last three, and of the specialized knowledge itself, including internal documentation of the process and records of how the transferee acquired it.
Show the process on paper, not only in the job description
Petitions that describe specialized knowledge only in adjectives tend to draw requests for evidence. Documentation of the process is more persuasive: internal design notes, control parameters, revision histories, training material written for the company's own staff, and any confidentiality treatment applied to it. Alongside that, records showing Solomon's own path through it, such as the projects on which the process was developed, the time invested and the internal training he delivered.
The corporate stack is separate and equally necessary, covering the relationship between the Bonfield employer and the U.S. entity and proof that both are actively doing business. Finally, an assignment description that keeps the proprietary commissioning work visibly distinct from routine maintenance protects the file when someone reads it a year later at extension.