An assembly with an offset is useful for a corridor section that has more than one definitive path, such as a highway with a service road on one or both sides. Create the offset by placing it a distance from the existing assembly baseline.
You then add subassemblies to the offset using the Subassembly Tool Palette.
The service road centerline(s) can be described by a specified offset line and offset point. The offset line is a vertical line that visually represents a secondary location that will follow an offset alignment when creating a corridor, and that subassemblies can attach to.
When assembly offsets are created, they are displayed on the Construction tab of the Assembly Properties dialog box. If desired, you can rename an offset on this tab by right-clicking the offset in the list, and selecting Rename.
The offset location is displayed in the drawing.
If there are multiple offsets associated with the assembly, you are prompted to select an offset. If there is only one offset associated with the assembly, it is removed.