Greetings, @jhummguen. I'll provide insights about this below.
At this time, the option to add a class to payroll deductions, such as a cell phone is unavailable. As an alternative, you can run a Payroll Summary report and export it to Excel. From there, you can manually add a column in Excel to include a class for it.
Here's how:
- Go to the left navigation panel and select Reports.
- In the Type report name field, enter Payroll Summary and click it.
- Filter the date and review it.
- Once done, select Export and click Export to Excel.

You can also check this resource to learn more about adding deductions for your employees: Set up, change, or delete employee-paid payroll deductions.
I’ll also include this article to help you filter your reports to display specific accounts or customers, as well as format the layout so that the correct data appears in the right place: Customize reports in QBO.
Please feel free to drop a comment below, @jhummguen.