I assume you know how to create bulleted and/or numbered lists in OneNote. Well, these lists automatically have the feature you are asking for! If you hover your mouse over a list item that has subitems you will see a symbol to the left of the item that
looks like a square box with a plus sign in it. Single-clicking that selects the item with subitems. Double clicking hides or unhides the subitems.
Hope this helps!
I am just another user, not connected with Microsoft in any way
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