Paying two employees commission on one sale is currently unavailable in QuickBooks Desktop. However, you can create a service item for the commission then track the sales transaction and select the employee.
Here's how:
Go to the Lists menu, then choose Item List.
Double-click the Serviceitem.
Put a checkmark on the This item is used in assemblies or is purchased for a specific customer: job box.
For additional reference, you can check this link: Add, edit, and delete items. It helps you learn about adding and editing items in your Products and services.
Please post again should you have any other questions or concerns. I'll be here to help. Have a great day!