Thank you for posting to the Autodesk Discussion Groups.
I would like to help you, but unfortunately, I do not understand your request.
Can you please reply with a detailed problem description that includes a set of steps to reproduce? Screenshots might help too.
your option if the lines are drawing objects
cleanup tools - find duplicates
if the line are on different layers . qselect a layer to highlight the line on that layer
shift select and delete one line copy and delete to see the line underneath, cntrl z to replace it.
if the lines are FDO objects open the data table and select each line in the table
post the types of line and details for a better answer
I do not understand your request
Dear Phil, there's nothing to understand: she simply wanna highlight the ovelapping lines, without deleting them.
Here's my workaround, Sue: