A salary type is a code that Quinyx uses to send number of hours worked to the payroll system. This will allow the payroll system to understand how the worked hours will be paid.
In Quinyx, there is a long list of default salary types. These salary types are connected to different settings in the agreement template and will be generated automatically if the settings are correct. Therefore, you can't change the original function of the salary type, however, you can modify the name to fit your organization and the payroll system you use.