A live section view is a special view of a 3D model section.
A live section view is always applied to all objects in the drawing. Unlike a 2D or 3D section, you do not choose a selection set of objects to be contained in the section. All objects are contained in the live section view. Their display properties are determined by whether or not they are situated within the bounding box of the section line.
The objects contained in the live section view are not converted into a section object, but are retained as objects in the drawing. They keep all of their properties and display components, and can be edited. The area of objects that lie outside of the section line, or objects that lie completely outside of the section line, can be displayed or hidden. The appearance of these objects, and of parts of objects outside of the section line, is controlled by the Sectioned Body component. When you render a live section, you can show the outside part as a half-transparent addition, for example.
The live section view can be turned on and off in a drawing.
Rendered live section view with transparent outside material