Using: Snapping & UCS
Line Stair is based on Chain tool.
Rail parameters:
Locked: seamless connection between end points.
AutoLock: automatic locking when end points are on the same position.
[Close]: connects end points.
[Delete last]: delete last point.
Active point parameters:
Index: index of currently edited point.
Position: position of edited point.
Distance: distance from previous point.
Angle: