Section 23(4)(ii) in The U.P. Fire (Gazetted Officer) Services Rules, 1984
(ii)Where appointments from any source fall short of the prescribed quota and appointment against such unfilled vacancies are made in subsequent year or years, the persons so appointed shall not get seniority of any earlier year but shall get the seniority of the year in which their appointments are made, so however, that in the combined list of that year, to be prepared under this rule, their names shall be placed at the top followed by the names, in the cyclic order of other appointees.