Thanks for dropping by, Marv1n.

I'm here to help you with showing billable expenses in invoices via QuickBooks Online.

In order to show the billable expense in invoices, you may want to check if this feature is turned on.

Here's how:

1. Click on the Gear icon.
2. Click on Account and Settings.
3. Select Expenses.
4. Click on the pencil icon under Bills and expenses.
5. Select the box to Track billable expenses and items as income.
6. Click on Save and hit Done.

I've attached some screenshots for your reference.

You can find more details in this article: How to enter billable expenses.

Hope I helped you get all straightened out today. Let me know if you have other questions about billable expenses in QuickBooks Online.