Hello there, jf-crokaert,

You'll want to create an expense for the item purchased. When the item is added in the inventory, create an invoice or sales receipt.

Here's how:

1. Click + New on the left pane.
2. Select Expense.
3. In the Payee field, specify a vendor. You can specify the name of a person or a business.
4. Select the Payment account to which to credit this expense.
5. Enter the date of purchase in the Payment date field and specify the Payment method for the expense.
6. (Optional) Enter a description of the expense.
7. Enter the amount of the purchase and any Tax paid (if applicable).
8. Select Save and close or Save and new.

Check out these articles for creating an invoice or sales receipts:

• Should I use an invoice or a sales receipt?
• Customize invoices, estimates, and sales receipts in QuickBooks Online

Stay in touch with me if you have other concerns.