A recent article in the McKinsey Quarterly on How CFOs can keep strategic decisions on track is a good read for any CPO looking to impress the C-Suite. Noting that judgement can often be colored by self-interest, and that CFOs are generally the most disinterested parties where strategic decisions are concerned, the article points out how a disinterested CFO can often provide hard financial data to counter inherent biases.
This implies that a great way to keep your strategic supply management decisions on track, keep the CFO happy, and impress the C-Suite is to run your proposals, with your projections, by the CFO before you take them to the rest of the executive suite. And if you need number crunching help, and they have staff, the CFO, who will likely be impressed that you asked for help before making a final recommendation, will probably be glad to lend you some support to confirm or verify your projections. Not always, but much more likely than if you make a presentation first and ask for help later.