Update the facts accurately and assess the effect on the proposed duties. Do not rely on support that is no longer available.
Keep the current operating picture
A new-office extension concerns actual operations, not an unchanged copy of an obsolete plan.
A U.S. new office involves less than one year of doing business and additional L-1A requirements, including a managerial or executive foreign year, sufficient premises and support for the qualifying role within one year of approval. Confirm early whether the receiving U.S. entity has sufficient operating history and staffing to be treated as established, since that affects both the evidence needed and the length of initial approval available. Keep the division's internal announcement, any customer communication, and the executive's departure from current duties behind the point where authorisation is actually in place, and design any interim leadership arrangement now.
The second block is preparation and filing: the business plan, the organization chart with hiring dates, the ownership chain, and the petition itself, with premium processing available if the company wants a faster decision. Share registers, payroll reconstruction and an honest organisation chart often take longer to produce than the petition takes to prepare, and the qualifying year abroad must already be complete before the petition is filed.