To change the pay schedule for some of your employees, you can either edit an existing one or create a new schedule, @Three Winters. I will explain the process to you below.

If you're using the QuickBooks Online (QBO) Core Payroll, you can follow the steps outlined above by @Buzzit. However, if you're using the QBO Advance Payroll, you can easily modify an existing pay schedule or have a new one and assign it to your selected employees. Here's how to proceed:
 

1. Navigate to the Payroll menu and select Payroll Settings.
2. Click on Pay Schedule. To modify an existing pay schedule, select the schedule you want to change, update the Frequency and Included Employees, and then click Save.
3. If you want to create a new pay schedule, click the Add button.
4. Enter the necessary details, and once completed, click Save.

Once you have created the pay schedule, you can now assign it to your employees. Here’s how:
 

1. From the Payroll, hit Employees.
2. Choose the employee you want to edit, then tick Pay Run Defaults.
3. In the Pay Schedule, select the newly created schedule and click Save.

For more information on editing pay schedules, please refer to the article: Set up pay schedules in QuickBooks Online Advanced Payroll.

Additionally, keeping track of the payroll for your employees allows you to understand the financial health of your business and manage your members effectively. For added convenience, you can run a payroll report directly in QBO.

We value your questions and are here to help with all your QuickBooks needs in this Community. If you have further queries about changing a pay schedule or any other QuickBooks Online aspects, please don't hesitate to post them in this thread. We're ready to assist you anytime.