This command trims lines and polylines. The intersection for the
trim location is calculated in 2D. The elevation at the
intersection of the trimmed polyline is interpolated from the
existing polyline vertices.
Select trim edge polylines.
Select objects: pick polyline for trim boundary
Select polyline to trim: pick polyline
Select polyline to trim (Enter to end): press
Enter
Pulldown Menu Location: Edit > 3D Polyline
Utilities
Keyboard Command: trim3d
Prerequisite: linework