Stair objects can act as targets or filters. When targets, Stair objects require you to define Focal Segments. They can be set up to allow movement upwards, downwards or in both directions to match the operational conditions of the venue being modelled. When Stairs are used to filter Entities, you need to set Up and Down filter settings.

If a Stair permits movement in the up direction, the Focal Segment is placed on the first stair of the flight; if a Stair permits downwards movement only, then the Focal Segment is placed on the last stair of the flight; finally, if the stair is bidirectional, Focal Segments are placed in both positions. When you draw stairs, the software will automatically choose the location of these Focal Segments.

Landings can be orthogonal or polygonal and flights of stairs can be drawn from any side of a landing, which enables you to create dogleg configurations and return stairs.

The procedures below describe how to create a single Stair and a linear multiple Stair as both Target and Filter objects. These forms of stair contain all the elements you need to construct the remaining types.

The basic elements of creating the different varieties of Stair are:

1. Drawing the Stair section.
2. Splitting the Stair at some point if it connects two levels across separated CAD.
3. Deciding on whether to add a landing (type y or n).
4. Drawing a landing.
5. Adding another Stair section and either completing the object or continuing with further landings and flights.
6. Deciding whether the Stair will be a Filter or Target object (type t or f).
7. Setting Stair parameters.