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When you run payroll in QuickBooks Online, you’ll have to select the pay period based on the schedule set up for the employees. For example: Weekly, Bi-Weekly and Monthly.
Since we're unable to select a half-a-year schedule to record the lump sum payroll amount, you can use the Commission Only option. This will help us override your normal payroll process.
Before doing so, you must set the pay type in the employees section.
Here are the steps:
Then, go back to the Employees window and click the drop-down arrow next to Run Payroll. Select the Commission Only and enter the pay details.
You can also check this article for more information: Pay Commission Separate From a Regular Paycheck.
For adding prior payrolls, I'd recommend contacting our Payroll Support Specialists. They have more resources available to record the information.
Here's how to get our contact information: https://payroll.intuit.com/support/contact/?infosrc=qs&service=64
Please let me know if you have other questions. Thank you!