To add a prefix to your employee's Works No / Payroll ID, go to Chart of Setup from the Employer / Setup drop down menu and click the Employee Works No Prefix link under the Payrun Customisation section. Then click the Edit button. Now enter the prefix code in the box given 'Employee Works No. Prefix Code, if any' . Once specified, a prefix code will then be automatically added to your employee's Works No / Payroll ID. Click on the Save button to save the changes you have made.