Hello there, davidlucylim,
Changing the hours of the previous pay needs a payroll correction. This process will affect the taxes you've previously filed. Also, you'll need to manually amend these tax forms.
Please reach out to our Payroll Support Team directly. They can create the correction and help you fill out the amended form. Here's how:
Here's an article for matching payroll in QBO for future reference: https://quickbooks.intuit.com/learn-support/en-us/payroll-and-stp/matching-payroll-in-quickbooks-onl....
Please let me know if there's anything else you need help with.