subsection head; assistant manager; chief clerk
係長に昇進して責任が増えた。
I was promoted to subsection head and my responsibilities increased.
係長の指示に従って書類を整理した。
I sorted the documents according to the subsection head's instructions.
うちの部署の係長は親しみやすく頼りになる存在だ。
The subsection head in our department is approachable and dependable.