Excel Data Management Formula Support

I’m working on an Excel workbook that stores and organises large volumes of GST- and TDS-related figures. The structure is solid—data validation, filters, sorting and some conditional formatting are already in place—but the heart of the file, the formulas and functions, now need a careful audit and refinement to keep the data flow error-free as the sheet grows.

Here’s what I need from you:
• Go through every existing SUM, IF, nested IF, VLOOKUP and XLOOKUP I’ve built, check for hidden inconsistencies and remove any redundant calculations.
• Optimise each formula so look-ups are fast and ranges stay dynamic even when new rows are added.
• Confirm that all totals reconcile across summary tabs and the GST & TDS sections.
• Return a final workbook that is fully tested, with clear notes or comments explaining any major changes you make.

If you can spot logic gaps quickly, love streamlining spreadsheets for reliable day-to-day data management, and can hand back a version that’s ready for submission without further tweaks, I’d like to hear how you’d tackle this.