The OFFSET command allows you to copy selected entities (lines, arcs,
circles, plines or others) and place the copy at a specific distance from
the original or through an existing position on another element (such as
the endpoint of a line, center of a circle, etc.). An OFFSET item will be
parallel or concentric to its original.
type offset at a Command: prompt
OR
select the Offset button
on the Drawing toolbar.

-Prompt: Through point: Use an Osnap,
an Absolute Coordinate, a Relative Rectangular Coordinate, or Relative Polar Coordinate to select the point to
place the offset object through.


--Prompt: Side to offset: With the LEFT mouse button, click
on the side of the original where you want the parallel copy located. See
the FIGURE below.


NOTE: The
last prompt will continue until you press Enter TWICE to
get back to a Command: prompt and exit
the Offset command.
Offset copies of lines are always parallel to the original.
Offset copies of an arc or circle are always CONCENTRIC with the original.