This document serves as a training manual for Oracle HRMS regarding retro pay processing methods for both single and multiple employees, detailing the steps needed to enable triggers and execute payments for backdated increments or adjustments. It includes examples and procedures for creating and linking elements to payroll and submitting requests for retro notifications and payroll runs. Key considerations regarding legislative and business group settings for taxation are also discussed, highlighting the complexities of managing retro pay across different jurisdictions.