I saw on you tube channel ( http://www.youtube.com/watch?v=Q3Ueo1NSFok ).
I want to please somebody to explaine me how to make this label where I can show the design slope in plan.
It looks like the video is using styles similar to the ones in the NCS templates supplied by Autodesk. Create a new drawing from one of these templates and check out the Superelevation Critical Point label styles.
Please note that these styles are very complex, using multiple Expressions and components. You may have to experiment for a while to figure out how all of the pieces work together.