Une image vaut mille mots...ici quelques centaines de milliers...:) désolé aussi pour la manoeuvre un peu brouillonne de la souris...une seule prise...:D
If you know Autocad, you can see here that trimming an object in Revit isn't quite the same story, I love it, besides many other things that I am currently discovering in this software, still very much in the learning process, but I am quickly getting the feel of it.
As for the quick video, not a great peace of art I admit, but a fun tool available at this site obsproject.com/, much more convenient than printscreens to try to explain it, but of course this is just a first try, the first cut unrevised by the art director...:D