A FEW GOOD CONSTRUCTION COMMANDS - AutoCAD 2010 Essentials - page 86

• The Lengthen command allows you to extend or trim length from an

existing line.
The Join command allows you to join similar objects (lines to lines,
polylines to polylines, etc.).

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4.2 THE OFFSET COMMAND

The Offset command will create a new object parallel to a selected object.
The new object (by default) will have the same properties as the original
object and will reside in the same layer.
There are two methods used in offset:
Offset distance
Through point
Make sure you are in the Home tab on the Ribbon , and, using the Modify
panel, click the Offse t button.

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The following prompt will appear:

Current settings: Erase source=No Layer=Source
OFFSETGAPTYPE=0
Specify offset distance or [Through/Erase/Layer]
<Through>:

Offset Distance
If you want to use this method, you should know the distance between the
original object and the parallel duplicate (i.e., the offset distance).
Then, select the object that will be offset.
Finally, specify the side of the offset by clicking to the right or left, up or
down, etc.
The prompts will be as follows:

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°
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Specify offset distance or [Through/Erase/Layer]
<Through>: (type in the desired distance)