What i would like to do in Dynamo is create areaboundaries 1,5 meter above my selected level to calculate my rentable area. In Holland we have different rules (compared to the standard Revit USA rules) how to caculate this area (NEN2580), so what i would like to do is create a plane 1,5 meters above my level, on this new plane i want the outline of all (bearing) walls, roofs and stairs bij intersection, then transform those lines into areaboundaries. For exanple: The area under the stairs wouldnt count unless its 1,5 meters high (rentable). The rules i just mentioned are just the basic rules i have to comply with, but just getting these outline would automate most of the the dull work.
As you can see, English is not my native language, sorry for that.