You can detach a wire from a structure, whether catenary or auxiliary, by completing the following steps.
Please note: Detaching a wire from a structure will delete any equipment that is attached to the wire at the chosen structure.
Step 1: Open 'Wire Manager' from the 'Wires' section of the Lineardraft toolbar
Step 2: Select the wire you want to detach from the 'Selected Wire' dropdown
Step 3: Click the 'Detach' button next to the structure from which you want to detach the wire
This will delete the wire point at that structure, and along with it any attached equipment.
The wire is now detached from the chosen structure, so will no longer appear in the 'Structures' list for that wire.
See also: Deleting a Wire