You can use several methods to create blocks. You can
A block can be composed of objects drawn on several layers with various colors and linetypes. Although a block is always inserted on the current layer, the block reference preserves information about the original layer, color, and linetype properties of the objects that are contained in the block. You can control whether objects in a block retain their original properties or inherit their properties from the current layer, color, or linetype settings.
Creating Blocks within a Drawing
Creating Block Libraries
Creating Drawing Files for Use as Blocks
Controlling Color and Linetype Properties in Blocks