work_items. On GitLab.com, this feature is not available. The feature is not ready for production use.
Use tasks to track steps needed for the issue to be closed.
When planning an issue, you need a way to capture and break down technical requirements or steps necessary to complete it. An issue with related tasks is better defined, and so you can provide a more accurate issue weight and completion criteria.
Tasks are a type of work item, a step towards default issue types in GitLab. For the roadmap of migrating issues and epics to work items and adding custom work item types, visit epic 6033 or Plan direction page.
The only way to view a task is to open it with a deep link,