No my dear friends, I have made the contours and I have used them, now I'm trying to compare two different volumens, so I have to do a new surface with the final site grading that I want, I have an urban project and I have designed the roadways, drainage, stormwater and water distribution systems. Everything made digitally, using Land Development, Civil Survey and Civil Design. I have to make the site grading(final level for each lot) for the project and there are a lot of lots, with different levels. At present I put the level with 4 points by lot, but in this case there are too many and I want to know if is posible to mark an area and put a level, then mark next area with the level reference from last one marked without create four new points with a new level each time for each lot.