It's good to see you here, @gardengift.

The option to add custom fields in QBO is only available in sales forms and purchase orders. With that said, while the option to edit custom fields in payments receipt isn't available yet, I suggest sending feedback directly to our product developers. They're always for ideas to consider on how to improve QuickBooks Online. You can refer to these steps on how to submit feedback: 

1. In your QuickBooks Online account, go to the Gear icon.
2. Select "Feedback."
3. Type in your suggestion and click "Next."

If you want to get updated on our latest happenings, you can visit this link: QuickBooks Online Blog.

I also recommend visiting our website for more tips and other resources you can use in the future: Self-help articles.

Please know that I'm only a post away if you have more questions about this or anything else. I'll be here to help. Keep safe.