Task in the same tree as the current one
From Planfix
Planfix supports the nesting of tasks, so an existing task can be made a parent task or a subtask of another task. We call tasks with such connections a task tree.
You can easily see the task tree in the filter by switching the view to tree:
Task tree in scripts
In scripts, the task tree is used to search for the required task in actions “Modify another task” or “Modify other tasks”:
Important
Scripts will not work if the connection between tasks is established using a custom “Task” type field. Tasks with such a connection are not a task tree.