I have Quickbooks Online. How can I create a custom form credit memo?

Hi AngVL,

Having the ability to customize credit memos in QuickBooks Online, currently isn't available.  If you would like to see the option available in future updates, please feel free to submit a suggestion to our Development team. Proceed to your Settings ⚙, then select Feedback. Enter your product suggestions, then select Next to submit.

Feel free to reach back out with other questions.  We'd be glad to help!