New layers can have alphanumeric names up to 31 characters long. In many cases, the layer names you choose are dictated by corporate, industry, or client standards. Layers are usually dedicated to each conceptual grouping (such as walls or dimensions). Each layer has an associated color and linetype.
If you consistently use a specific layering scheme, you can set up a template drawing with layers, linetypes, and colors already assigned. For more information about creating template drawings, see Starting with a Template File.
The Layer & Linetype Properties dialog box sorts layers alphabetically by name. If you're organizing your own layer scheme, name layers carefully. By using common prefixes to name layers with related drawing components, you can use wild-card characters in layer name filters when you need to find those layers quickly.
Sometimes you may want only certain layers to be listed in the Layer & Linetype Properties dialog box. Use layer filters to limit the layer names listed. To limit which layers are listed, you can filter the layer names based on
Layer name filters are set in the Layer & Linetype dialog box under Show.
The number of layers you can create in a drawing and the number of objects you can create per layer are virtually unlimited. You can remove unused layers at any time.