Duplication of horizontal alignment from existing alignment in civil 3d

[Anonymous]

Can I duplicate horizontal alignment from the existing alignment in civil 3d?

Then I can edit the duplicate horizontal alignment without touching the existing alignment. 

[jroot · Accepted solution]

One way to do it:

Offset the alignment 1', this creates a polyline.  Offset this polyline back 1' to the original location, then create another alignment from this polyline.

[Anonymous]

I don't why my offset line is display?
Many thanks,

[Topmig]

Can you be more specific?

[jroot · Accepted solution]

If you offset the alignment but can't see it, either your current layer is OFF or maybe the offset distance was so small the polyline appears to be right on top of the alignment.

[LucasHicks]

Sometimes you can't see an offset until you click on the screen.

[Anonymous]

The offset line should appear between the blue line and the white line.
Red Line shows the distance between the offset line to the blue line. The blue is the centreline.

The red comes up when I

See attached offset line

[jroot]

Is this for sure an Alignment and not a Corridor that you are offsetting?  Does the command line say "Cannot offset that object"?

[Anonymous]

Not corridor

[Anonymous]

My current layer was switched off,

It works now.

Thanks

[tcorey · Accepted solution]

Use the AutoCAD Copy command. It's only one step to where you want to be.

[Anonymous · Accepted solution]

Thanks