If you want to put just the last paragraph of a list item into a new list item, you can simply press Shift+Tab.
But what if you want to split a list item where mulitple paragraphs (or other elements?) are below the split point that should all end up in the new (next) list item?
For this, I now found this process:
- Put the cursor where you want to split the list item.
- Press Enter to create a new blank paragraph.
- Create a new list (which becomes a nested list).
- Move the text cursor up so that is blinks horizontally between the new nested list (with that one blank new paragraph inside) and the elements above that should stay in the original list item.
- Press Enter AGAIN. ->> Creates a new list item that now includes all elements that where in the old list item below the text cursor.
- Remove that nested list (with that one blank new paragraph) that is now at the beginning of the new list item.
Technically, this seems to work also without creating an empty paragraph first, but since a nested list obviously needs to be created with some element (which represents tinkering with that element) it is IMHO better to use a blank new "throw-away" paragraph, so that nothing can get changed unintentionally.
I think that could come in handy, if the list item to be split did contain lots of and maybe even complex elements.