Hello, @jhughes517.

I understand that combining billable expenses when creating an invoice would be of great convenience for you and your business. However, it's currently unavailable in QuickBooks Online.

You may consider creating a bundle item to group your products and services.

Here's how:
 

1. Go to the Sales tab, then Products and Services.
2. Select New and choose Bundle.
3. Check the box for "Display bundle components when printing or sending transactions."
4. Add the products or services in the line items. (You can add more by clicking on Add lines.)
5. Don't forget to Save and Close.

When creating an invoice, choose the bundle item you've set up in QuickBooks.

You can also send your feedback to our product engineers. This way, they can consider adding this feature in future updates.

Here's how:
 

1. Click the Gear icon in the upper-right corner.
2. Select Feedback under Profile.
3. Share your feedback.
4. Click Next to submit.

I've added an article you can refer to on how to receive and record invoice payments: Record invoice payments in QuickBooks Online

Let me know if you have further questions about tracking your expenses. I'm just a reply away. Keep safe!