Thanks for reaching out to us here in the Community, @sancrisme. 

You unable delete users that have created transactions. What you can do is change it into inactive instead. Then change their password to something that can't be guessed.

If you're referring to QuickBooks Desktop, you can inactivate your employees that no longer work for the company.

Here's how: 

1. Open your QuickBooks Desktop company file.
2. Go to the Employees menu and select the Employee Center. 
3. From the list of employees, select the first employee to inactivate.
4. Right-click on the employee's name and select Delete Employee. 
5. Select OK to confirm the deletion. 

If you're not paying the employee, for the time being, you can unselect them in the Enter Payroll Information window when you run payroll.

If you're using QuickBooks Online, you can follow the steps: 

1. Sign in to QuickBooks with a user profile that has permission to manage users.
2. Select Settings ⚙.
3. Select Manage users.
4. Find the user you want to delete. Then select the arrow icon in the Action column.
5. Select Delete.
6. In the confirmation window, select Delete again.

Keep in mind, deleting a user is permanent. But you can still view their history in the audit log. 

For your reference, you may check out these articles for more information: 

• Add, edit, or delete accounts in QuickBooks Desktop

• QuickBooks Desktop Users and Restrictions 

If you have any other questions or concerns, feel free to post below. Thank you for your time and have a nice day.