Serving size help

I am really struggling to understand how to use the serving size section when I create a recipe. It seems that if I add another serving size, it throws the whole thing out of sync. I haven't been able to find any useful tutorials so am hoping some of you can help.

Ideally, I would like to be able to create nutrition facts per 100g. This makes is easy to then work out numbers based on a weighed portion.

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