Offset Multiple & Close

With the 'Offset Multiple & Close' command you can select open linear entities. The command will offset the entities to both sides and close the offsets creating an outline of the original entity. You can set the distance and whether the selected entities should be erased. You can also pick a layer to place the offsets on by selected an entity on that layer. The closed ends of the newly created outlines can be either straight or round, whatever you prefer.