Not automatically. Explain the duties and knowledge involved across the actual proposed assignment, including later phases that differ materially.
Do not hide the later work
Identify what would follow implementation and who would direct it. The reviewer should assess the actual scope rather than a favourable opening phase presented as if it describes every future task. Include the other L requirements as well.
Duration belongs in the description, not in a footnote to it. State how long the opening phase is expected to last and what proportion of the whole assignment it represents, because a first phase covering two months of a three-year posting explains very little about the posting. Where later phases are less defined, say so plainly and give the point at which they will be defined; an honest gap with a date attached can be assessed, whereas an implied continuity cannot.
Confirm separately that the qualifying year of employment abroad with a related entity falls within the three years preceding the request, since that period is fixed by the calendar and can lapse while a project schedule slips. If the assignment is expected to approach the five-year L-1B maximum, plan the sequence around that limit from the outset rather than raising it at the final extension.