When adding a task to the dreamcatcher you will also be able to set sub-tasks on it as well.

A possible way to achieve this simply would be to designate a keyboard character that tells the system "Everything after this character is a subtask of the initial request."

Example: I put into my dream catcher (or text to dreamcatcher or browser to dreamcatcher) the following: "Task 1/SubTask A/Subtask B" - The "/" character would make it so that "SubTask A" and "SubTask B" are put within "Task 1".