Creating 3D Geometry - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 850

6. Move the cursor directly above the Move grip tool and then click and
drag the z-axis. Notice that all four boxes are moving and each leaves
a ghosted version of itself at its original location (see Figure 16.23).
Enter 2 ′ 11 ↵ ( 889 ↵ ) to move the selected block-outs.
FiGuRE 16.23 Move the remaining block-outs 2 ′ -11 ″ (889 mm) in the
positive Z direction.
7. A move operation in a 3D view can sometimes be deceiving. Click
the Top text located on the ViewCube to switch to the Top view, and
make sure the block-outs are all located properly. If they are, use the
ViewCube to switch back to the southwest view once again. If they're
not, undo to the point before the move and try it again.
Cutting the openings
You are ready to start the Boolean processes and cut the openings in the walls.
When prompted to select an object, be sure to click on the edge of the 3D objects
and not a face, or the selection may not be successful.
1. Thaw the A-WALL-EXTR-3DOB and A-WALL-INTR-3DOB layers, and
freeze the A-GLAZ layer.
2. Click the Subtract button on the Solid Editing panel of the Home tab,
or enter SUBTRACT ↵ .