WorkForce Payroll allows you to reopen finalised Payroll runs, one at a time. Reopening a pay run does not reset it, it just marks it as unfinalized. This means that any adjustments that were made to the employees will not be affected.
Step 1: Launch the Payroll Module
Step 2: Click on Undo Run from the left-hand side main menu
Step 3: Click on the Undo button to reopen the last finalised pay run (the pay run highlighted in the Run #, From, and To columns).
After that point, visit the Process Payroll tab and adjust the employees as needed.