Hi Phil, 

Thanks for posting in the Community!

Let me guide you on how to add an overtime pay in your employee's pay run. Let's make sure you've created an overtime pay category first. Here's how:

1. Click on the Payroll tab.
2. Click on Payroll Settings.
3. Click on Pay Categories.
4. Check from the list if you have an Overtime pay or not.
5. if not, you can add click on Add to create an overtime pay category.
6. Click on Save.

Once done, you can create the pay run and then click on the employee name to show the Earnings section. Click on Actions button to Add Earnings and select Overtime Pay category. Here's how:

1. Click on New pay run.
2. Select the pay schedule, pay period and pay date.
3. Select the employee name, and then click on Actions.
4. Select Add earnings.
5. Select the overtime category, and enter the hours to pay.
6. Click on Save.

You can check this link to learn more about Create and manage Pay Categories in QuickBooks Online Payroll. 

Drop by again in the Community if you have other QuickBooks concerns. I'm around to help you.