Here is the Help File for Layer States From Express tools
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Express Tools Layer Manager
LMAN
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Layer manager
Manages layer settings by allowing you to save and restore layer configurations into layer states. Layer states can be modified, restored, or renamed during an AutoCAD session. Layer states are saved in the drawing, but they can also be exported to or imported from a LAY file.
Dialog Box Options
Save Saves the current layer settings into the selected layer state. If a new name is specified, a new state is created.
Edit Displays the Layer Properties Manager dialog box, where changes can be made to the selected layer state. If no layer states exist, a new one is created.
Rename Renames a layer state.
Delete Deletes a layer state and displays the following message: Are you sure you want to delete <layer state name>?
Import Displays the Import File Name dialog box to specify a LAY file name, drive, and directory for importing into the current drawing. A Find File button opens the Browse/Search subdialog box to locate saved .lay files.
Export Displays the Export File Name dialog box to specify a LAY file name, drive, and directory for exporting from the current drawing.
Options Sets options to use for layer status restore operations. This option allows you to specify the layer properties to be restored (on/off, freeze/thaw, color, linetype, and so on).
Restore Restores the layer settings in the selected layer state without closing the dialog box.
Help Provides help for the Layer Manager.