Hi friend. As per W.B.S (ROPA) rules 2009, it will be beneficiary to you to have the promotional increment on 1st July by excessing an option. Though you may have it on 11th January but in such case you will loss the annual increment. In this regard I would like to request you to follow the link below. It will help you to fix your pay and refer the concerned Govt order. https://wbxpress.com/topic/fixation-of-pay-in-excel/
Name : NRIPENDRA NATH MAJUMDER
DI/PSA Memo No. : 1029 Memo Date : 30/06/2011
File No : SEC/BRS/00239/2011
File Status Pension File received and File No. assigned.