Is there support for adding subcategories from a parent category?

[TechnoFox]

Is there support for adding subcategories from a parent category?

Currently when a parent category is added to Docs, the child categories are not added automatically.

[JammyDodger]

If you start typing the parent category name, an option should appear to add that plus its subcategories:

If you click on that it should pop them all in the input box automatically.