Navigate to the invoice for which you want to create a credit note.
Use the overflow menu (•••) and select Issue credit note.
Select the Reason for the credit note.
Use the Credit amount field to adjust the amount of credit to apply to each line item. The Amount remaining field shows the remaining amount that can be credited.
The Total amount to credit field shows the total amount of credit that will be applied to the invoice.
Optionally, add a Memo to the credit note. It will be visible to the customer.