The six columns
Reel or coil number, construction as printed, conductor metal and size, footage (with the method used), condition, and where it sits. That is the whole manifest. Everything else is commentary.
One line per reel
Do not group reels of different constructions on one line to save space. A grouped line forces the buyer to re-ask, which is the delay the manifest exists to prevent.
Condition codes that mean something
Use plain language: new surplus, never installed; partial, tagged; partial, measured; weathered jacket; cut ends unsealed; recovered from service. Those six phrases cover almost every real condition and each one prices differently.
Attach the photographs to the manifest
Number the photographs to match the manifest lines. A buyer can then check a specific reel instead of scrolling a gallery, and disputes at loading drop sharply.