1. Depend upon category of employee
2. In staff case , only sanction person required
3. In Workmen Category, Manpower plan as no of criteria :
a) Sanction
add
b) Weekly off common -Nil
On rotation basis -16.7% for 7days working or reduced as per no of days
add
c) Turnover %-should not be more 2% or actual data
add
d) Leave %
On Roll will be a+b+c+d
This is general practice , u can add or minus according to your situation