Tax Issue in sales order

Hi All,

We have an issue.

In sales order we have 4 line items 10, 20, 30 & 40. First to line items are taxable and last 2 are not.

Issue by the business -The total 13% tax charge does NOT list the sub total that the 13% applied to.

They want to see a subtotal of dollar of the taxable item; In this case; it would be the $213.84 from line 10 + the 3727.62 from the line 20 ( 3941.46) as the basis for the  13% tax. 3941.46x13%=512.39

currently we only list a sub total for the entire invoice.

Thanks,

Ashok