I’ve got a problem that feels like it should have a simple solution. I am modeling a landscape based on meter contours that i have draped and created tighter contours from that i will later want to mill. I have edited the contours slightly manually afterwards to fit my preferences. Now I would like to extrude solids from my contours that aren’t closed. I tried to create surface planes to split all at once, but when i try to do so all of the contours split or trim the planes as if they are extruded infinitely in the z direction. How does one split or trim lines only in their actual place so that one line splits one surface and not all? If this is not possible how should I go about the problem without manually selecting one plane and one line at a time?