French to English Bus/Financial IT (Information Technology) Job task using Excel

One of the tasks, within a list, of a new volunteer going to do a civil placement within an energy company in Norway.

Rassembler, analyser et assurer un suivi sur Excel par champ avec les donnees OPEX et CAPEX mensuelles detaillees des operateurs afin de verifier les previsions annuelles de l'operateur et de preparer nos previsions de cloture regulieres;

I can't express this, but am not completely clear on what it means anyway.