Payroll and Query

Hello All

1. Need to query Number of Years of service,Number of active days in Month,Year (Deducting Inactive days) in payroll to make payment of a wage type, how to query?

2.We have a payment of Other allowance as  Rs.1000 but for this Jan2016 alone we need to pay 10% extra for an employee group & Subgroup differently, how to do it (From February onward it will be RS.1000 again for the same EG&ESG combinations).

Reg

SK