To export a pay run to QuickBooks Desktop, go to the "Company Menu" and click "Integrations", and then click "Payroll Exports."
Next, click "Export" on the right of the list to save the file on your computer.
After you save the file, open QuickBooks and select File > Utilities > Import > IIF Files... Then locate the file and click open. QuickBooks will prompt you that the data has been imported.