TODO lists with lots of items, how to create and manage?

Thank you, that is a good video, what he says at about 5 min how to use the sidebar is very useful.

Where I run into limitations is when I have a lot of sub items, let’s say a shopping list with many items.
Currently I paste, and then go through item by item with ctrl-enter to change the todo state.

I found this query to exclude sub-items from a search: