Identify the actual knowledge and evidence relevant to the proposed assignment first. New training may not address the requirements on which the case depends.
Match preparation to the real proposal
Clarify professional scope, necessary translation and official charges. Do not assume an expensive technical course turns an unrelated role into a qualifying assignment. The applicable route and evidence should guide preparation.
Price the evidence-gathering, not only the filing. Retrieving records from internal systems, exporting a project history, obtaining written confirmation from managers in another country and translating any document not in English all consume time that someone either bills or absorbs. Hypothetical example: a company publishing continuing-education material for teaching hospitals decides that a technical writer's process knowledge justifies a transfer, then discovers that most of the supporting evidence sat with a manager who has since left, so reconstructing it costs more than gathering it would have.
Name an owner inside the company for each item on the evidence list and set a date for each, and ask the adviser whether responding to a request for evidence falls inside or outside the quoted scope. New training bought to strengthen a profile rarely helps, because the classification looks at knowledge held during the qualifying employment abroad, not knowledge acquired to support an application. Ask, before work starts, what a second round of evidence would cost if one became necessary, since knowing that figure changes how much care goes into the first round.