How do I configure the system so that a second pay rate can be captured?
To populate the "Second package" field to capture an employee's second pay rate, enable the "Displays a second payrate on the payrates screen" company setting.
Navigate > Configuration > Basic Settings > Company Settings > Company Settings > Remuneration
Navigate > Employee > Payroll Processing > Pay Rate Details
The second pay rate (package) can be used when defining the income base on a component.
Navigate > Configuration > Payroll > Payroll Config > Payroll Components