How Do You Retrospectively Create a Calculation Card that Has Already Been Setup?

Hi there. We have an employee record that has the calculation card Taxable Benefits effective 01-Jan-24 along with the component details that have been processed through payroll from this date. However, we have been made aware that the employee has a car that we need to add into the calculation card. As the registration date of the car is before the effective date on the calculation card, there is no way of changing the effective date of the whole Taxable Benefits calculation card and it's components.

As payrolls, transfers to subledger etc have all been run, there are around 20-30 payroll flows that may need to be reversed out so that the component could possibly be deleted and entered from an earlier effective date. Is there an easier or better way of doing this?