To set up a fixed overtime in the payroll module, please do as follows:
Go to the Payroll module, Setup, OT Table setup, and click the OT Rate tab.
Click New, Key in the ID, select the OT Rate Type as Fixed Rate, key in the OT rate amount, and Save.
Click the OT Table tab, move the new OT rate ID to the selected field under the Standard OT table, and Save.
Go to the Assign Employee tab, move over the employees.