Hello everybody.

I have a problem, I searched the forums but could not find a solution.

I had a 3D model in Autocad that I made a 2D section of it. I got the Section Cut geometry (Red) and the Background geometry (Blue) in separate layers. So far so good. The problem is that underneath the Section lines, I also have Background lines, of the whole section. The command Overkill is not useful here to eliminate these duplicate lines, because if I use it, then Autocad will randomly select both Section and Background lines to remain.

What I need is to use some kind of Overkill that gives priority to Section lines and eliminates every line underneath that layer. I have tried selecting all the Section lines and moving them to the top order and then do Overkill but it doesn't work either

I hope I could make myself clear on this.

I attached two images, Red lines are on top of the Blue lines, and I want to subtract all Blue parts that are underneath the Red lines.

Thank you so much.