You can organize a set of related block definitions by creating the blocks in the same drawing file. Drawing files used this way are called library drawings, and the block definitions can be inserted individually into any drawing that you are working on. Block library drawings are not different from other AutoCAD LT drawing files except in how they are used.
When you define each block definition in the block library drawing, use BMAKE to include a short description of the block that can be viewed in Content Explorer. You can also use BMAKE to save the library drawing itself along with a description.
Optionally, you can also document each block definition by inserting it in the drawing area of the library drawing. In addition to the block geometry, you can include text that documents the block name, the date of creation, the date of the last modification, and any special instructions or conventions. This creates a visual index of the blocks in the block library drawing. For an explanation of the schematic representation shown, see Understanding How Blocks are Stored and Referenced.
Use Content Explorer to view and copy block definitions individually from block library drawings (or from any existing drawing) to your current drawing. Content Explorer will not overwrite an existing block definition in a drawing with one that comes from another drawing.