Hello there, @Direct1.

I'll help you adjust your employee's salary in QuickBooks Desktop.

Yes, you're right. You can set up an additional payroll item if you've already run your payroll. Thus, you can adjust the employee's salary to reflect the one day off he took and deduct it from your next payroll.

Here's how:

1. Go to the Lists and select Payroll Item List.
2. Select Payroll Item, and select New.
3. In the Select Setup Method window, select Custom Setup and click Next.
4. Click Deduction, and choose Next.
5. Enter the details needed, then tick Finish when done.

Once done, you can add the item to the employee's profile. Please see this reference for further guidance: Set up, change, or delete employee-paid payroll deductions.

Also, you can refer to this article on how to run a report that tracks the employees' pay rate changes over a period of time: Run payroll reports.

Feel free to comment below if you have additional questions about managing your employees. I'm always around to help. Stay safe, and more power to your business.