The Odoo help documents state that we should have a Partial Refund option for credit notes. But, that is not an option for us. We just have Reverse, and Reverse and Create an Invoice. 

How do we enable Partial Refunds, in Ver. 17? The end goal is to process restocking fees.

( I am not allowed to post a link here to the page.)

From the page:

Issue a credit note

You can create a credit note from scratch by going to Accounting ‣ Customers ‣ Credit Notes, and by clicking on Create. Filling out a credit note form works the same way as an invoice form.

However, most of the time, credit notes are generated directly from the related invoices. To do so, go to Accounting ‣ Customers ‣ Invoices, open the related customer invoice, and click on Credit Note.

You can choose between three options:

• Partial Refund
• Full Refund
• Full refund and new draft invoice