Advanced Excel Logic Formulas

I’m rebuilding a series of worksheets and have hit a wall with the logical side of Excel. The job is centred on writing-or correcting—advanced logical expressions: nested conditions, array-based lookups, and other formulas that go well beyond simple IFs. The workbook already contains sample data, named ranges, and my own partial attempts; you’ll step in, make the formulas bullet-proof, and keep them readable so I can maintain them later. Clear English explanations of what each key formula is doing are essential, either in-cell comments or a short companion note—whichever you find clearer. You should be comfortable with dynamic arrays, INDEX/MATCH variants, SUMPRODUCT, LET/LAMBDA, and similar functions that streamline complex conditional checks. If VBA ever becomes the cleaner answer, I’m open to that too, but the first choice is pure formula solutions. Deliverables: • Revised workbook with fully working formulas • Brief written walkthrough of the logic used If you’re an Excel expert who enjoys untangling intricate logic, I look forward to working together.