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Thanks for posting to the Community, @d-hahn.
Let me provide you the steps on how to add employees in QuickBooks Online.
To seamlessly save it, please make sure that you've entered the information correctly.
You can refer to this article on how to add, update or make an employee inactive: Add, edit, or inactivate an employee.
I'll add this article as your reference in setting up a payment schedule and how to assign the payment schedule to an employee: Employee payroll schedules in QuickBooks Online Payroll Enhanced.
Keep me notified by leaving a query to this post or tag me(@Jovychris_A) if you need further assistance. I'm always here to help. Enjoy your day!