Withholding Process - Controlling inclusions when dealing with large voucher volumes

We are a large company running PeopleSoft Financials 9.1, PeopleTools version 8.52.  We have vendors where we have a split on individual vouchers that we need to pay withholding and nonwithholding on the same voucher.  Is there a way to manage this situation dealing with large voucher volumes where a voucher can have multiple voucher lines with a mix on withholding and nonwithholding voucher lines?  We are aware of the "Update Voucher Line Withholding" page, however it is cumbersome due to the large volume of vouchers we process.