Revit arhitectural problem

[sinisa1982513875]

i have a problem, i no idea how to solve this problem: i have a a circle stairs and wall, and i want to cut wall above stairs.i load families wall and i gone to swept blend but revit don't wont pike up 3d line when i clik on 3d stairs curve line (curve line is a fragmantations and revit have not a join line options). sorry for my poor english i hope that understand me what i wont to say.

[fjtdogeno]

Can you use ramp instead of wall. See the attached image. Send me your email i will send to you the revit model of this images. Its quite big file to upload here.