Subtasks are a requested feature, but one workaround for us has been to create a Task Group object and treat that as a task, and it contains Tasks (that play the role of subtasks).
However, when we want to create Task Templates, we can't include other objects such as Folders/TaskGroups in these templates.
The feature request is to: include objects in Task Templates, AND have the ability to make the Tasks subjects of such Folders/Objects
This would make the replication of common tasks / workflows a lot easier and more organized. As presently, have to create the Task