The clerk and treasurer, severally, in cities of not fewer than 100,000 and not more than 500,000 inhabitants operating under this Article 5 shall appoint the various clerical help and subordinates in their respective offices and shall be held responsible, severally, for the fidelity of all persons so appointed. A deputy clerk in the city clerk’s office in a city described in this Section shall be appointed in the manner prescribed in Section 3.1-30-10.