To reference civil data

To reference external files containing civil data, use the following procedure.

Note: When you reference files, you cannot modify or change those files nor can you change their display. For example, you will not be able to turn off the triangles and contours in the terrain.

Either:

on the Home ribbon tab, select the References tool in the Primary group

or
key in dialog reference

The References dialog opens.
Select the Attach Reference tool.

The Attach Reference dialog opens.
Select the reference file and click OK. The referenced file is added to the list in the References dialog.

If you have referenced an alignment or terrain, you must set those items as active.