That is how you do it and yes you have to do it for every single one by hand.
If nothing happened, check the new snippets you added and ensure they have "shown" and "auto add" checked.
Another way to add snippets that I use frequently when I want to add multiple copies of the same snippet is Add Snippet --> Types for this Section --> xxxxxxx which will list all of the snippet choices assigned to the section. I add it then drag it into place.
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