Contour lines of grading benches

I am not an expert of civil work but we are trying to learn how to provide such data using GM. 
After creating a flattened area from an area feature and setting the software to create benches (1m bench every 5m drop) we would like to create contour lines that reflect this shape, so a line on the inside of the bench and one on the outside. It is a very common thing to be seen on drawings so we hope it is possible to do it in GM. Please advice.
Best regards
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