Excel guides.
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Guides
ExcelCombine monthly files with Power Query, using an LLM one step at a time
Point Power Query at a folder of same-shaped files, then use ChatGPT or Copilot only to write or explain individual M steps, testing each one before adding the next.
ExcelTurn a recorded macro into reusable VBA with ChatGPT, then test it on a copy
Record the task, have ChatGPT clean up and comment the code and make the ranges dynamic, then compile, step through and test it on a copy before it touches real data.
ExcelRun a Python analysis in Excel with Copilot's Advanced Analysis
Put the data in a Table in a cloud-saved workbook, start Advanced Analysis in Copilot, let it write Python cells, and read each one before you reuse the code.
ExcelGet up to speed on an inherited workbook before you let AI change it
Work on a copy, inspect connections and named ranges, trace backwards from the outputs you need, and only then ask Copilot to describe what a sheet does.
ExcelDecode a long Excel formula with Evaluate Formula and an LLM
Paste the formula into ChatGPT or Claude for a plain-English explanation, then confirm each part with Evaluate Formula and F9 so you aren't relying on a wrong answer.
ExcelExtend an existing financial model with Claude in Excel without breaking it
Have Claude explain how the tabs connect and annotate complex formulas first, then extend the model following the original patterns while you check its assumptions.
ExcelClean a messy workbook: have Copilot flag issues, then decide yourself
Use Copilot as an auditor rather than an autopilot. Ask it to flag anything that needs manual review on its own sheet, then fix the data with Excel features you control.
ExcelWrite complex Excel formulas with Copilot, then prove they work
How r/excel users actually use Copilot for formulas: describe each field, take the draft as a starting point, test it on awkward rows, and check every reference before filling down.
ExcelAutomate a recurring Excel report: deterministic Python, AI only for the fuzzy parts
The pattern practitioners recommend on r/AI_Agents and r/automation: scripts for ingest, transform and validate, an OpenAI or Claude API call only for fields that need interpretation, and a hard stop when totals don't reconcile.
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