The breakdown for each line is tracked, so if it is the invoice form you're referencing for display of the sales tax detail, then you would have to modify the applicable business forms you are using. The sales tax tables that contain the detail are common for each document type, so you could use your modified acknowledgement to indicate the relationships and extent of the changes you would perform in Crystal Reports.

The sales tax summary amount for the line is indicated on the Sales Tax reverse tab in Detail.

If you click on the elipsis, you be able to view the breakdown of the tax calculation. It is linked to the detail from tarInvoiceLineDist.STaxTranKey, but how the tables are populated depends on how sales tax options are configured for the customer, item and company. Generally, you need to build the detail from the data in tciSTaxTran and tciSTaxCodeTran.