Stories are simply a way of organising Design Layers. They are necessary for BIM and they also enable you to create separate boundings, for things like the components in your walls, using Level Types. When designing a building generally you will have several layers that are common to each story, for example, each story will likely have a floor layer, wall layer, ceiling layer etc. Stories let you create these automatically and set their 3D height relative to the height of the story, rather than the ground. This also means if, for example, you need to create a double height entrance level, you simply change the story height and the rest will adjust themselves!
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