How do I recorded billable expenses for already existing invoices?

Hi there, useraccounting8.

Thank you and welcome here in our Community. I'll share steps to ensure that you're able to record the billable expenses for already existing invoices.

I suggest creating a bill to record the billable expenses for existing invoices. From there, you'll have the option to check the billable box and choose the specific customer. 

Here's how:

1. Click + New and choose Bill.
2. Select the payee.
3. From the Category column, select the expense account for the transaction.
4. Enter the description and amount of the expense and select the Billable checkbox.
5. In the Customer column, select the customer you want to bill for this expense.
6. Fill in the necessary field. Then, hit Save and close.

For additional information, you can click this article: Enter billable expenses.

Once done, you can now add or link the billable expenses to an invoice. To start with, I recommend going to the Sales page and locate the existing entry. Please follow the steps below.

1. Click Sales at the left menu. Then, go to the Invoices section.
2. Find the invoice and click it to expand the page.
3. Click the Edit invoice button that appears in the right corner.
4. On the Invoice page, click on the arrow beside the Balance Due.
5. Click on Add on the billable expense/s under Add to Invoice to add them.
6. Hit Save.

Please refer to this article to see steps on how you can Uncheck the box in the Billable column of an entry to delete a billable expense charge: How to remove a billable expense charge.

I'll be always here to help you if you have any other questions about billable expenses, just add a comment below. Have a great day ahead!