Is it posible to restrict access to some banks to a user?

Thanks for reaching out to us here in the Community, @teresa-tweetybea 

At the moment, restricting a user to specific bank accounts isn't possible in QuickBooks Online (QBO). I know how this feature is useful on your end.

For now, it is best to put forward your suggestions through feedback to our product developer. They may consider your suggestion in our future updates. Here's how: 

1. Select Settings ⚙, then Feedback.
2. Enter your comments or product suggestions. Then select Next to submit feedback.

Also, please refer to this article to learn more about the different user permissions in QBO: User roles and access rights in QuickBooks Online.

Additionally, you might want to check out this article on how to view and manage usage limits in QBO: Learn about usage limits in QuickBooks Online.

Let me know if you need further assistance with user access permissions by leaving a reply below. I'm always here to help. Have a good one.