Similar or closely related block definitions should be collected in a single DWG file. For example, in the details block library supplied with AutoCAD Architecture, the block definitions for all the different sizes of nails are collected in a block library drawing file called AecDtlLib_Nails.dwg, and all block definitions detailing carpet accessories are in a file called AecDtlLib_CarpetAcc.dwg. As shown below, for each block definition, the drawing should include a block reference inserted on a horizontal line to show how the block’s base point is used to position the block in relation to other geometry. For each block reference, there should also be a text label containing the name of the block.
Setting up block library drawings this way makes it easy for the user to quickly survey the entire library. It also helps you in the process of cleaning up the drawing.