The Layer Management feature in AutoCAD MEP lets you organize, sort, and group layers using layer standards, layer key styles, and layer overrides. Layer standards define the naming of new layers according to the structure defined in the standard. AutoCAD MEP includes a number of predefined layer standards and matching layer key styles based on common building system industry norms.
You can change any part of the layer name structure using layer key overrides within the layer key style. You can also override layer names for all of the layer keys in a layer key style or for individual layer key styles.