Thanks for reaching out to us. Allow me to help provide some insights about the employee's overtime hours.
Since the employee wants to use the overtime hours at a later date and QuickBooks doesn't have an option to hold the overtime hours accrual. You'll need to add a note on your employee's information so you'll be able to track the remaining accrual once you create a paycheck for your employee.
To add a note, here's how:
At the top menu bar, click Employees.
Select Employee Center.
Select the name of your employee.
On the right side, click the Notes option.
Click Manage Notes drop-down arrow.
Select Add New.
Type an information that will help you determine the overtime hours accrual of your employee.