Add multiple tasks to a Parent task



I often use tasks as projects. Often when clearing my New tasks I want to add multiple items to a parent task. Currently as far as I can see the only way to do this, is if all the tasks concerned (new tasks and parent task) are in the same list (ie project/tag). This is often not practical.

It would be immensely useful if multiple tasks could be selected and then added to a parent task. Similar to how we add multiple tasks to a project.