Nothing is worse than building a massive harness with hundreds of wires, cables, and segments before realizing it needs to be broken up into smaller sub-harnesses. I'd like to be able to select wires, cables, and segments in my harness and to demote, promote, or drag and drop them into other harnesses. Even if it breaks the pinning, it'd be so much of a time saver to not have to redo wire/cable names, wire/cable types, and to reestablish routing work point locations from scratch.