Batch wise Pricing

Dear All,

I have received a requirement from the Client that

they need a batch wise Pricing in the R/3 System eg: If material (A) is of 500 and the Material Code XY00.

and if the cost of Product Increase /Decrease and the Material Code remains the same XY00

How will i maintain in the batch wise pls let me known step by step so that i can Configure it its on the Urgent basis Pls help

Thanks

Sana