Withholding tax customisation for Range Amount

Hello All,

We have a requirement to calculate Progressive WHT on a range basis. By progressive i mean while calculating the WHT it should consider the Net payment done to the supplier and withheld amount in the financial year. Need to check the cummulative payment amount is lying in which tax slab and calculate the tax accordingly, Finally WHT tax should be deducted from the supplier invoice as tax calculated earlier minus Already tax withheld. we are storing the cummulative Payment done and withheld amounts on the Supplier Site DFF.

Can someone help me on this. This is a Bangladesh client requirement.