Welcome to the Community, @hosanna-fox.

Let's update your time tracking settings so you can charge your clients and projects at different hourly rates.

Here's how:

1. Click the Gear icon.
2. Under Your Company, select Account and Settings.
3. From the left menu, click Advanced.
4. In the Time tracking section, select the edit (pencil) icon.
5. Check the box beside Make Single-Time Activity Billable to Customer.
6. Then, just leave the Show billing rate to users entering time unchecked.
7. Click Save.

After turning on the feature, let's record the hourly rates of your clients and projects. Let me guide you how:

1. Click the Plus (+) icon.
2. Select Single Time Activity or Weekly Timesheet.
3. Enter the information, then check the box beside Billable (/hr) and enter the Rate in the box.
4. Once done, Click Save and close.

Here's an article for your reference: How to Enter Billable Time by Job.

Fill me in if you have any other questions with QuickBooks Online. I'll be around to help.