The first method: draw with the offset command, which is faster and more accurate. Offset command-Enter offset distance-Select centerline offset. Repeat the command to complete another edge.

The second method: modify the format of settmlinegs in the standard editor, set the offset to the value you want to draw, and then draw with multiline command after confirmation. Steps: Format under the menu bar-Multi-line Style-Modify-Modify in the pop-up dialog box-Modify the contents of graphic elements.