3DS Max files are organized into layers, similarly to AutoCAD or Rhino files. By default, a new 3DS Max file contains a single layer (“0”). This layer cannot be renamed or deleted.
Choose Tools > Manage Layers, or click the Layer Manager icon on the Main Toolbar.
To add a layer: Click the Create New Layer button on the upper left-hand corner of the palette.
To rename a layer: Right-click on the layer name and choose Rename.
To delete a layer: Right-click on the layer name and choose Delete.
To set a layer as Current: Click on the check mark next to a layer name.
To hide/unhide a layer: Click on the space in the Hide column.