This capsule makes it easy to create subtasks.
Note: although this capsule works just fine, it is still a work-in-progress.
Make sure you have Taskwarrior-Capsules installed.
Install this library:
pip install taskwarrior-subtask-capsule
That's all!
tw <some filter> subtask <task description>
Say that you have a task (id #28) that you'd like to create a subtask for:
tw 28 subtask This is my subtask's title.