On the Vertical Definition tab of the Slab: definition dialog, you can specify the location of a slab with respect to an active story.
The Slab level list includes all the defined levels of an active story of a building. The location of a slab in a building is defined by selecting a plane (for example, Top - Story 2, Bottom - Story 2). This list also contains all inclined planes defined for a selected story (see: Definition of a plane).
In addition, you can define the reference edge of a slab with respect to the upper or lower level of a story:
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Reference edge |
Location of the slab with respect to the story level |
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When defining the vertical location of a slab, you can define an offset from the lower or upper level of a story. If the offset equals 0, the definition line coincides with the upper or lower plane of a story. Click 
to select a horizontal element edge that determines an offset value.