Layers
Layers are virtual levels in a drawing, analogous to acetate tabs (overlays) in traditional drafting. Layers enable you to sort objects in your drawing by type, by creation order, or by any criteria that suits the way you work. You can also use layers to protect certain objects from being edited or deleted.
...
This dialog is used to create layers, to assign properties to each layer, and to organize layers. It is divided into two frames. The first frame show the tree containing the layer filter, and layer templates. The second frame show the layers. controlled or derive from the item selected in the tree. The top node of the tree controls and shows all layers in the drawing.
Layer 0 is the default layer, and all objects are placed here unless otherwise specified, or unless another layer is created and made active. Layer $CONSTRUCTION is created when construction geometry is created (see Construction Geometry). Neither of these default layers can be deleted, but you can change their properties.
...
VP Columns in Layers window: In addition to the main columns in the Layers window there are five columns with a VP prefix. VP stands for Viewport, and these columns are use to control how objects will appear within a selected viewport.
The columns are: VP Visible, VP Color, VP Line Style, Pen Width, Print Style.The VP columns operate in the same way as the main columns, except the settings effect on selected viewports.To use the VP column settings:
...
Layer Prefix: By default, the layers are named "Layer 1, Layer 2," etc. You can change or remove the prefix. The @ symbol is a placeholder for the automatic layer number.
Note: Many of the functions available from the Layer toolbar are also available by right clicking and opening the local menu.
Creating a New Layer
- Open the Layer manager by selecting Format / Layers, or by clicking the Layers icon on the toolbar. A dialog opens. In the dialog, right click on Layer and select new layer. Then assign a name for the layer in the Layer column (or accept the default name).
- Adjust the various layer settings, such as color and line style.
...