Projects > Issues
After selecting an issue from the Issues list, you can perform several actions: Edit, Log time (for the current day or previous days), Watch/Unwatch, Copy, Delete (if permitted) and add relations.
Edit an issue to change properties, log activity time (for the current date only), or add comments or notes. A private note will be visible to its author but also by administrators, assignees, and watchers.
Add a Subtask (i.e., create a new issue as a sub-issue) or add Related issues by selecting a relation type and filling in the related issue ID # (you can also type part of the related issue name and select it from an “on the fly” generated list; the ID will be filled in automatically).