A practical starting point
One scope you can review.
Choose one recurring management report. Bring approved sample exports, existing spreadsheets, metric definitions, and the person who uses the result. A scoped first engagement can produce a source map, reconciled metric specification, reporting prototype, and a refresh-and-ownership plan.
How to evaluate the work
Agree what useful means.
Compare the prototype with agreed source totals, test missing and late records, check refresh completion, and ask the intended users to work through representative decisions. Establish the baseline before setting improvement targets.