Properties
You can assign properties such as color and linetype to individual objects, or as default properties assigned to layers.
In the following drawing, the walls, exterior stone facing, doors, fixtures, cabinetry, HVAC, electrical, and text were created using different colors to help differentiate between them.
The Properties Panel
Click Prop. 
on the left tab to open the Properties panel.
The Properties panel displays a list of all the important property settings. You can click most of the fields to change the current settings.
If no object is currently selected in the drawing area, the Properties panel will show the properties of the current layer. While in this state, any changes you make in the Properties panel will affect future creations on this layer.
Verify and Change Object Properties
You can use the Properties palette to verify and change property settings for selected objects. If you click an object in your drawing to select it, here is what you might see in the Properties palette.
If objects are selected in the drawing, the Properties panel shows the current properties for the selected object. You can change these properties by clicking it and changing the setting. A property that is set to "ByLayer" inherits its setting from its layer.
If you select several objects, only their common properties are listed in the Properties panel. If you change one of these properties, all the selected objects will change in one operation. Selecting objects is covered in more detail in the Modifying topic.
Tip Let's say you want to move a series of objects to a different layer. You can do the following:
- Select the objects in the drawing area
- Go to the Properties Panel
- Under the layer drop-down, select the layer that you want to move the objects to
Match the Properties of Objects
For a fast way to copy the properties of a selected object to other objects, use the Match Properties tool 
in the Modify command list, or enter MATCHPROP or MA in the Command line.
After you click the Match Properties tool, select the source object, and then select all of the objects that you want to modify.
Linetypes
Dashed and other non-continuous linetypes are assigned from the Properties panel.
In the Linetype drop-down list, choose from the available list of linetypes.
Lineweights
The Lineweight property provides a way to display different thicknesses for selected objects. The thickness of the lines remain constant regardless of the scale of the view. In a layout, lineweights display and print in real-world units.
You can leave the lineweight set to ByLayer, or you can specify a value that overrides the layer's lineweight. In some cases, the lineweight previews look the same because they are displayed in approximated pixel widths on a monitor.
Regardless of how the lightweights appear on your monitor, objects always print at the lineweight you specify.