Our organization is on Peoplesoft 9.2. Supplemental taxing and pretax deductions

In processing transactions in Payroll for NA, we combine earnings taxed at a supplemental rate with earnings using employee tax data, pretax deductions appear to only be attributed to the earnings using employee tax data. Is there a way for the pretax deductions to be attributed to both types of earnings (those taxed at a supplemental rate and those taxed using employee tax data)?