When creating users and employees both are stored in the same table.
How do I assign a user_name, after creating an employee?
Can I assign one user_name to multiple employees?
The USER_NAME must be unique.
There is no easy way to change an employee to a user. You may need to go to the database to fix the issue.
Before I can answer you question, I would need to know what you are trying to accomlish.
What problem are you trying to solve by having multiple logins for a single user?
