Hello Jairo,

The steps on how to create a payment item are only applicable for QuickBooks Desktop users. For those who are using QBO, you can directly make partial payments by only receiving the only part of what the customer owes on the invoice.

Here's how:

1. On the left panel, click Sales.
2. Go to the Customers tab.
3. Click the customer name.
4. Search for the open invoice.
5. Click Receive payment.
6. Below Amount received, enter the partial amount.
7. Click Save and close.

Check out these screenshots:

For more insights into recording customer payments, check out the article I recommend on this:

Record a customer payment.

Feel free to let me know if you need further assistance with the payment process in the Online version. The Community is always up to lend a hand.