Show Product Balance on Prepaid Statement

Would like a way to put show the balances of the items on the prepaids on the prepaid statements. Right now on the prepaid statement it only shows you the total balance and not each item. The prepaid shows you what you first put on the statement for the items but it does not sure the current balance and the customer has to do a lot of manual calculations if they need to know how much of one item they have left on the prepaid.