Note: The Floor Plan outlines of Meshes and Slabs on remote stories (if they are shown on stories other than their home stories) are displayed using the line type set at Project Preferences > Legacy.
The Gravity function also works for Slabs: turn on the Gravitate to Slab command as an aid in placing elements onto the surface of the Slab.
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Slab Reference Plane

Each Slab has a reference plane which plays a role in intersections with other elements. The ability to flexibly assign a Slab ...

Creating Slabs

Set Slab parameters in Slab Settings. See Slab Tool Settings. New Slabs can be created in either the Floor Plan or ...

Placing Holes in Slabs

You may need to make holes in Slabs to accommodate objects such as staircases, or for an open atrium space. Select a Slab ...