Section

Select entities

Specifies the entities from which the section is created.

Choose one or more 3D solids; this command does not work with 2D regions.

Specify first point on section plane

Pick a point to specify the plane in which the section lies; prompts you:

Specify second point on plane - pick another point.

Specify third point on plane - pick a third point (three points define a plane).

Object

Creates the section from entities that intersect the 3D solid; prompts you:

Select a circle, ellipse, arc, 2D-spline, or 2D-polyline - choose an entity.

You can also use elliptical arcs.

The entity defines the plane through which to create the section.

Zaxis

Creates a section in the plane defined by one point on the plane, and a second on the plane's normal (z axis); prompts you:

Specify a point on the section plane - pick a point to define the location of the section plane.

Specify a point on the Z-axis (normal) of the plane - pick another point to locate the normal.

View

Creates a section in the plane of the current 3D viewpoint; prompts you:

Specify a point on the current view plane - pick a point to define the height of the section.

This is probably the easiest of the options.

XY

Creates a section parallel to the x,y plane; prompts you:

Specify a point on the XY-plane - pick a point to define the height of the section above or below the x,y plane.

YZ

Creates a section parallel to the y,z plane; prompts you:

Specify a point on the YZ-plane - pick a point to define the height of the section above or below the y,z plane.

ZX

Creates a section parallel to the z,x plane; prompts you:

Specify a point on the ZX-plane - pick a point to define the height of the section above or below the z,x plane.