LAYER: Command LAYER: CommandThe LAYER command allows you to create multiple layers to draw on.
It also allows you to control the color, line type, activity, and visibility
of individual layers.
To Change to an Existing Layer:
Click on the arrow on the RIGHT side of the Layer Status Window (see FIGURE below), drag the cursor onto the layer name you wish to select and click the Left mouse button once. The layer will change.
(Note: The figure above has been shortened.)
To add a new layer or change layer properties through the Layer &
Linetype Properties
dialogue box you can:
click on the Layer 
button
OR
select Layer..., under the Format Menu.
The Layer & Linetype Properties dialogue box will appear.
To Create a New Layer:
Open the Layer & Linetype Properties dialogue box, click on the New button in the Layer window. A layer named Layer 1 will appear in the list of layers.
While the Layer 1 name is highlighted, type a new name for the layer.
Click on OK to exit the dialogue box.
To Load a Linetype:
Open the Layer & Linetype Properties dialogue box.
Click on the Linetype tab (located on the TOP LEFT corner of the dialogue box) to bring the Linetype window to the front.
In the Linetype window, click on the Load... button. The Load or Reload Linetypes dialogue box will appear.
In the Load or Reload Linetypes dialogue box, scroll down to the linetype you wish to load, click on the linetype name with the LEFT mouse button, and then on OK to return to the Linetype window. Click on OK to exit the dialogue box.
To Change the Linetype
of a Layer:
Open the Layer & Linetype Properties dialogue box.
Click on the linetype listed in the configurations beside that layer name in the Layer window.
The Select Linetypes dialogue box will appear listing the loaded linetypes. Locate the linetype, click on it, and then on OK to exit the dialogue box.
To Change the Color of the Layer:
Open the Layer & Linetype Properties dialogue box.
Click on the square in the list of configurations next to the layer name in the Layer window.
The Select Color dialogue box appears with a display of the colors you can choose.
Click on an appropriate color. (NOTE: The color assignment is related to the printing line thickness.)
Click on OK to return to the Layer window of the Layer & Linetype Properties dialogue box. Click on OK to exit this dialogue box.
To Delete
a Layer:
Open the Layer & Linetype Properties dialogue box.
Click on the layer name in the Layer window, and then the Delete button. You will be returned to the Layer window. Click on OK to exit the dialogue box.
To Change the Name of
a Layer:
Open the Layer & Linetype Properties dialogue box.
Click on the layer name with the LEFT mouse button to highlight the name.
Type in a new name.
Click on OK.
To Make a Layer
Invisible:
On the Layer Status Window drop-down menu, locate the name of the layer.
Click on the lightbulb 
in the list beside the layer name.
The lightbulb will turn gray to indicate that the layer is
invisible.
NOTE: The lightbulb is a toggle between invisible and visible.
Return to the AutoCAD Command List.