Welcome back to the Community, @WGM.
In QuickBooks Desktop (QBDT), the ability to assign a class for the company portion is currently unavailable. You can only choose between assigning it to Earnings Item and Entire paycheck.
If you selected the Entire paycheck, your payroll expenses will be prorated by class on reports. To identify how payroll expenses are distributed to each class, use the formula:[Rate X # of hours]/ Total wages = percentage/rate of the proration for each Class.
To learn more about the process, consider checking out this article: Tracking payroll expenses by class, department, or location.
Please know that I'm only a few clicks away if you have any other questions or concerns. I'll be more than willing to help. Have a good one!