Click the Layers tab to display the list of layers.
On the Layers tab, click the New Layer button.
Tip:
You can also create new layers using the New Layer command on the shortcut menu.
Layer names are not case sensitive, can contain 250 characters, and can include the following characters: ($), (-), and (_). If you export your Draft document to AutoCAD any non-supported characters, including spaces, are converted to underscores in AutoCAD. Also, even though a layer can contain 250 characters, only AutoCAD version 2000 supports long layer names. If you export to any other version of AutoCAD, long layer names are truncated to 26 characters.