I have multiple companies set up in QBO and I need to be able to limit access to a single company for some of our users. Is that possible? Thanks! Darin

Glad to see you here in the Community, @darin2. I'm here to lend a hand so you’ll be able so you’ll be able to manage your users in QuickBooks Online.

You have the option to modify a user’s role in QBO.

Here’s how:

1. Sign in to QuickBooks Online Company with a user profile that has permission to manage users.
2. Select Settings.
3. Select Manage users.
4. Find the user you want to edit. Then select Edit in the Action column.
   
   
    
5. In the User type dropdown ▼ menu, select the new user type.
6. Select the user settings, if applicable.
7. Select Save.
8. Ask the user to sign out and sign in again into QuickBooks Online to see the updates.
   
   

 
You can check this article to know more about adding and managing users in QBO.

To learn more about this, I have added a few links below for reference. These articles details about how to add users and what roles can you grant to them.

• User roles and access rights in QuickBooks Online.
• How to Add & Manage Users For Your Company.

 
Please let me know if you need clarification about this, or there's anything else I can do for you. I'll be standing by for your response. Have a great day and stay safe.