Welcome to the Community, Alire_25. I appreciate your detailed information.
 

You can use billable expenses to show rental expenses as having been paid. A billable expense is an expense you incur on a customer's behalf when you perform work for them. They can be used to record and track expenses so the customer can reimburse them when they receive their invoice.
 

Initially, you'll need to turn on billable expenses.
 

Here's how:
 

1. Use your Gear () icon, then go to Account and settings.
2. Access the Expenses tab.
3. Find your Bills and expenses section and click its Pencil () icon.
4. Turn on Show Items table on expense and purchase forms, Track expenses and items by customer, and Make expenses and items billable.
5. Set a Markup rate, Billable expense tracking, and Sales tax charge if necessary.
6. Enter Bill payment terms.
7. Select Save.

Now you'll be prepared to enter billable expenses and add them to invoices.
 

Please don't hesitate to send a reply if there's any additional questions. Have a wonderful Friday!