I'm glad to narrow down the steps in deleting old credit cards on the Subscription & Billing section, @Buster.
Please follow the step below:
- Sign in to your QuickBooks Online account as the primary admin user.
- Go to the Settings icon and select Account and Settings.
- Choose the Billing & Subscription tab on the left-hand side.
- In the Payment method section, click on the Edit ✎ option next to the credit card you want to remove.
- Select Delete and confirm the deletion of the credit card information.
To learn more about managing your billing and subscription information, you can open these articles:
Aside from your subscription, you can also get more tips about your data security, company information, login credentials, and more through this link: Account management gathers topics for your Intuit Account.
If you have any other follow-up questions, please let me know by adding a comment below. I'm more than happy to help. Wishing you a good one!