Welcome to the Community, @rhondaeci.

I'm here to assist you in adding a billable handling fee line item on QuickBooks Online.

Indeed, you need to add a Handling Fee as a billable line item in your invoice. Here's how:

Step 1: Enter a billable expense.

1. Select + New.
2. Select the transaction, Bill.
3. Select the payee.
4. In the Category column, select the expense account for the transaction.
5. Enter the description and amount of the expense, then select the Billable checkbox.
6. In the Customer column, select the customer you want to bill for this expense.
7. (Optional) Enter or make sure the markup % is correct, then select the Tax checkbox or choose a tax agency if you want to charge tax.
8. Select Save and Close.

Step 2: Add billable expenses to invoices

To reimburse the cost, link the billable expense to your customer's invoice.

1. Select + New.
2. Select Invoice.
3. In the Customer ▼ dropdown menu, select the customer you created a billable expense for. This opens the Add to Invoice window.
4. Select Add on the billable expense you want to charge to your customer.
5. Select Save and Close.

Moreover, I'll be sharing these articles to help you find out how to record, edit, and delete expenses in QuickBooks Online: Enter and manage expenses in QuickBooks Online

If you need further assistance or any clarifications the Community is always here to help 24/7. Keep Safe!