I’m working with an Excel workbook that has grown messy over time and I need it transformed into a reliable decision-making tool. First, the raw data must be cleaned end-to-end: remove all duplicates, fill or flag missing values in a sensible way, and standardise every column’s format so dates, numbers and text behave consistently. Once the dataset is solid, I want an interactive dashboard—built entirely in Excel—that lets me explore: • Monthly sales trends so I can spot seasonality • Product-level performance to highlight best- and worst-sellers • Regional sales distribution for quick comparisons across territories Feel free to leverage PivotTables, PivotCharts, Power Query or any native Excel features that keep the file self-contained. The final deliverable should include: 1. A cleaned data sheet ready for future refreshes 2. A separate, visually clear dashboard tab with slicers or filters for time, product and region If anything in the source data prevents full automation, leave concise notes so I can update it easily later.