script logic to calculate the total amount of each product for each customer

I have two input schedules, one is to input the unit price for each product, another one is input the volume for each customer.

For unit price input schedule, I use a dummy customer number for all the product C_UNIT, since the customer number is the same for all the product.

For the volume input schedule, all the customers and products are listed at their base level. the account dimension has A_Volume and A_Total for  the

volume of each product and the total amount for each product which equal volume*unit price

I need to create script logic to for the calculation..

How could I apply the following logic by using the script logic.

for each customer,

for each product.

total amount  = volume * unit price.

thanks,