If you do not want an employee department to be displayed in the employee admission form, you can inactivate it or delete it. However, you cannot inactivate or delete an employee department that has already been assigned to an employee.

At the top of your dashboard, click the module access icon > Administration > Human Resource > Setting > Add Employee Department to open the Add department page.
  1. Click Edit option beside the employee department you want to edit, select the Inactive status, and then click the Update button. Employee departments that are inactivated and moved under the Inactive Department list.

  1. Click Delete beside the employee department you want to delete.

For more information, watch this-