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Offsetting an Object
Click on the desired object.
Select the desired direction (see Rules* below) to create the new offset from the Offset dropdown control. For a closed object: A positive value offsets to the inside. A negative value offsets to the outside.
Enter the desired offset amount in the Offset reveal field.
Click the Offset button. The object will be offset in the direction and by the amount specified.

*RULES:

Enclosed Objects:

Positive value offsets to the inside.
Negative value offsets to the outside.
Arcs and Curves Greater than 180 Degrees use the same rules as closed objects.
For lines, imagine a line's start point to be the center of a circle. The plus offsets clockwise and minus offsets counterclockwise.