Revised salary calculation for basic and HRA

In our company salary calculation for basic and HRA is given below

Present

1000   01   1       15,000.00            B     INR     50.00

1000   01   2       99,999,999.00    B     INR     60.00

1003   02   1       99,999,999.00    B     INR 40.00

1003   03   1       99,999,999.00    B     INR 30.00

WAGE TYPE

1000 BASIC

1003 HRA

And now proposed

GRADE     BASIC        HAR

G                40%           40%

M                40%           40%

E                50%           30%

O,S,Etc     50%           30%

AND LEFT %age TO SPL. ALLOWNCE

Kindly tell me how to do this.Its urgent