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Changing your employee's last name is easy, @ssharma221.
You'll want to open your employee's profile and change his/her last name from there. Let me guide you how.
In your QuickBooks Online (QBO) account:
You can also check this great article for additional reference: Add, edit, or inactivate an employee.
Then, in case you'll need to reimburse your employee's, you can read this resource for the details: Reimburse an employee.
Do get back to us in case you have any other concerns or questions. Our door is always open for you.