A primitive solid is a ‘building block' that you can use to work with in 3D. Rather than extruding or revolving an object, AutoCAD has some basic 3D shape commands at your disposal. From these basic primitives, you can start building your 3D models. In many cases, you get the same result from drawing circles and rectangles and then extruding them, but doing it one command is generally faster. Using these with Boolean operations can be a very effective way of drawing in 3D.
AutoCAD 2010 Multi-Leaders- Training on controlling the scale for the block. Editing or creating text styles from within the multi-leader style dialog. Adding a vertical attachment point.