Hi,
You might find that read interesting 📘 The tale of Jerod the unwise in the subtask maze
Nope, not natively anyway. External app and tools could do it.
I never remember, you should run a quick test. I believe Universal Reporting has an option to keep them, get them only or exclude them. But project dashboards don’t.
Overall, subtasks don’t behave the way people usually expect them to, and that leads to frustration and lack of clarity. Having many projects is fine by me, having many subtasks usually not…
Take care!