Creating Shafts from a Floor Plan

From the Shafts from Floor Plan dialog box, click Select a floor plan sketch , and in the tree, click the floor plan sketch.
From the dialog box, in Starting story, select the starting story.
From the dialog box, in Number of Stories, enter or select the number of stories that the shaft is to pass through.
In the dialog box:
1. Enter in Maximum opening width a value to reflect the largest opening in the sketch for elements such as windows and doors.
  Your entry is the largest distance the command attempts to identify as a door, window, or wall opening.
2. Enter in Minimum shaft area a value to reflect the minimum shaft area in the sketch.
  The command does not create any shaft smaller than your entry.
3. Enter in Maximum wall thickness a value that reflects the maximum thickness of the shaft walls in the sketch.
  Your entry is the largest distance between lines that the command considers for a wall. The command does not create any wall thicker than your entry.
To convert all valid boundaries in the sketch to three-dimensional shaft spaces, click Generate All .
To remove walls around the shaft, in the Shafts From Floor Plan dialog box, click Remove Walls .
Remove Walls is a toggle. When you remove walls, the system highlights the toggle.
To see a preview of the valid shaft boundaries and openings, click Analytical View .
To only make specific valid boundaries in the sketch into three-dimensional shaft spaces, click each individual boundary that you want to convert.
Click .

The system creates the three-dimensional shafts both in the 3D area and in the tree, where it lists the shafts under Shell and Core.