offset

Offsetting creates a new object whose shape parallels the shape of a selected object. Offsetting a circle or an arc creates a larger or smaller circle or arc, depending on which side you specify for the offset.
A highly effective drawing technique is to offset objects and then trim or extend their ends.
2D polylines and splines are trimmed automatically when the offset distance is larger than can otherwise be accommodated.

You can offset
Lines
Arcs
Circles
Ellipses and elliptical arcs (resulting in an oval-shaped spline)
2D polylines
Construction lines (xlines) and rays
Splines

To offset an object by specifying a distance
From the Modify menu, choose Offset.
Specify the offset distance.
You can enter a value or use the pointing device.

Select the object to offset.
Specify a point on the side where you want to place the new objects.
Select another object to offset, or press ENTER to end the command.

To offset an object through a point

From the Modify menu, choose Offset.
Enter t (Through).
Select the object to offset.
Specify the through point.
Select another object to offset, or press ENTER to end the command.
(fr.autocad.help)

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