I am using a feature line to create a grading for a residential house pad. The county grading ordinance calls for a 6' drainage terrace (bench) when slopes exceed 40' in vertical height. I know that for corridor grading you can specify a slope bench with a subassembly but that is not what I am doing here.
I'd like a solution where the grading remains dynamic because I know that benching will cause slopes to cross property lines. I also want to keep the dynamic nature to be able to make adjustments to balance the earthwork.
I'm trying to picture what you want to do here. Perhaps a sketch or drawing would help. You apparently want to use feature lines and grading objects instead of a corridor because it's quicker and easier to edit, but you need the decision logic of an assembly.
It might be possible to create a hybrid that will work. Create an alignment that retraces the feature line you're using to define. For the assembly - start with a LinkVertical, which will be targeted at the feature line then add whatever daylighting subs you need to finish the slope.
You should be able to edit the control feature line and let the corridor handle the daylighting and surface model on auto-rebuild. The only problem I can see would be if your building pad has inside corners.