You can use the timesheet feature, Anthony. This lets you set up different classes and add the hours.

I'll guide you how:

1. Click the Plus sign (+) icon.
2. Select Weekly timesheet.
3. Select the employee and customer.
4. Select the payroll item and class.
5. Add the hours.
6. Tick the Billable (/hr) box if applicable, then enter the rate.
7. Click Save and close.

Here's how it looks like:

When you pull up the Time Activities by Employee Detail report, you'll see the hours spend on each class. Here's how:

1. Click Reports.
2. Enter Time Activities by Employee Detail in the Find report by name field.

Refer to my screenshot below.

I'll also add a reference about setting up timesheets for better guidance. 

Don't hesitate to drop a comment below if you need more help with tracking your payroll.