助理文書主任主要執行與下列一項或多項職能範圍有關的一般文書職責，其中可能涉及多類範疇的職務：(a)一般辦公室支援服務；(b)人事；(c)財務及會計；(d)顧客服務；(e)發牌及註冊；(f)向政府律師提供支援，並為法官和法庭使用者提供法庭支援及事務室服務；(g)統計職務；(h)資訊科技支援服務；以及(i)其他部門支援服務。助理文書主任會調派至本港任何一個地區的政府辦事處工作，在執行職務時須使用資訊科技應用軟件，並可能須不定時或輪班工作和在工作時穿着制服。

An Assistant Clerical Officer is mainly deployed on general clerical duties which may involve multi-tasks relating to one or a combination of the following functional areas - (a) general office support; (b) personnel; (c) finance and accounts; (d) customer service; (e) licensing and registration; (f) support to Government Counsel, and court support and registry services to judges and court users; (g) statistical duties; (h) information technology support; and (i) other departmental support. An Assistant Clerical Officer is subject to posting to any government offices in any districts of Hong Kong; required to use information technology applications in the discharge of duties; and may be required to work irregular hours or shifts and wear uniform at work.