Using Layers to Organize Your Drawing - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 256

Later in the topic, you'll create new layers and assign them colors of your
choice. Use this opportunity to explore the True Color and Color Books tabs of
the Select Color dialog box, and try using some of these colors in your drawing.
Keep the Layer Properties Manager dialog box open. You'll use it to assign line-
types in the next section.
You can delete selected layers using the Delete Layer button, shaped like
a red X, in the Layer Properties Manager dialog box. You can delete only
empty layers — those containing no objects. You can identify empty layers in
the Layer Properties Manager by the grayed-out icon in the Status column.
Assigning Linetypes to Layers
When you assign a color to a layer, you can choose any color supported by your
system. This is not so with linetypes. Each new drawing has only one linetype
loaded into it by default (the Continuous linetype). You must load any other
linetypes you need from an outside file:
1. If it's not already, open 06A-FPLAY1.dwg by clicking the Open button
located on the Quick Access toolbar.
2. In the Layer Properties Manager dialog box, click Continuous in
the column for the A-ROOF layer to open the Select Linetype dialog
box (see Figure 6.13). In the Loaded Linetypes list, only Continuous
appears. No other linetypes have been loaded into this drawing.
FiGuRE 6.13 The Select Linetype dialog box
3. Click Load to open the Load Or Reload Linetypes dialog box. Scroll down
the list to the Dashed, Dashed2, and DashedX2 linetypes (see Figure 6.14).
Notice how, in this family, the dashed lines are different sizes.