Custom Advanced Excel Formulas

I need a power-user to transform several workbooks by replacing my patchwork of manual entries with robust, well-documented formulas. Array logic, dynamic ranges, XLOOKUP, INDEX-MATCH combinations, SUMPRODUCT, and similar techniques will be required to automate calculations, generate clean summaries, and flag inconsistencies the moment new data is pasted in.

The raw sheets are ready; I will share a brief spec that outlines the metrics I expect to see and examples of the typical data drops we receive. Your solution must remain compatible with Excel 2016 or later and run without add-ins.

Deliverables
• Updated workbook(s) containing the finalized formulas
• Clear in-sheet comments or a short companion note explaining the logic so I can maintain it myself
• Demonstration that the results stay accurate when rows are added or data ranges expand

Acceptance criteria
• All requested outputs match benchmark results I will provide
• No broken references or volatile functions that slow recalculation
• Easy for a non-technical colleague to refresh or extend the model later

If Power Query or a light VBA tweak would materially simplify the job, feel free to suggest it, though pure-formula solutions are preferred. I look forward to seeing how you can streamline this workflow.