Sub-issues have been introduced on GitHub to facilitate complex issue management scenarios.Sub-issues allow breaking down larger issues into smaller tasks, improving tracking and dependency management.The feature aims to enhance organization and focus within teams, aiding in tracking progress and defining work.Designing sub-issues involved creating a hierarchical structure for tasks, updating data models, and rendering logic.Sub-issues are stored in a table that maintains parent-child relationships to support nested issues.GraphQL endpoints were utilized to expose sub-issues, facilitating efficient data fetching and display.Creating, editing, and managing sub-issues was emphasized for a seamless user experience, with a focus on accessibility.Usage of sub-issues within GitHub teams improved project management by enhancing visibility and control over tasks.Feedback from beta testers was instrumental in refining the feature, leading to enhancements like additional metadata display.The call to action encourages users to try sub-issues for task breakdown and requests feedback to further enhance the feature.