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How can I change the z coordinates of a group of lines in 3D dgn all to zero without going through each element one at a time?
You should be able to select all of the elements and then select the Move tool.You can then either use AccuDraw to drag them to the correct elevation,or the key-in 'xy=#,#,z' the z being the elevation you want them moved to, and the # being equivalent to keeping the current x and y value.
You could also use the CivTools utility provided by Bentley on the Be Communities here:http://communities.bentley.com/communities/other_communities/bentley_library/m/bentley_library_utilities/174155.aspx