I want to create a food. Can someone explain serving size, value, unit & servings per container

As an example I have a baguette. The nutrition description on the back of the bag is for 1/2 the baguette. I eat a quarter of the baguette per serving.

So if I want to post an entry for that how would I do it? Re serving size, value, unit & servings per container?

Also will it automatically half the ingredients for me, or do I have to work that out for myself?

Thanks.

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