Turn a recorded macro into reusable VBA with ChatGPT, then test it on a copy

On the Developer tab (or View → Macros), select Record Macro, do the task by hand, then stop recording. The poster: "as simple as hitting start record, do your thing, end record." They also warn that recorded macros are finicky: "Ranges changing, tiny differences etc throw it off."

Open Alt+F11, copy the recorded module, and paste it into ChatGPT. The poster's process: ChatGPT "cleans it up making it more efficient and labels what each line is for", then "I can just ask it make ranges continuous and now the ranges for new data is no longer a problem." Tell it about real quirks in the data, such as blank rows.

Save a copy of the workbook as a macro-enabled .xlsm and close the live file. Excel's Undo can't reverse VBA, so the copy is your only undo. Insert a module and paste the cleaned code.

Run Debug → Compile VBAProject, which catches syntax and declaration errors but "not wrong logic." Then search the module for Delete, Clear, SaveAs and hard-coded sheet names, and work out which sheet and rows each line hits.

Step through with F8 on a small test sheet, then run it on awkward data: blanks, one row, duplicates, numbers stored as text, and running it twice. The top-voted reply on the thread: "test the hell out of it. Run the code on edge cases, cases that should fail. Try to break it."

Run it on the real file only after the copy passes, and start with a small slice. Compare control totals before and after, and judge success by the row counts you expected "rather than judging success by the absence of an error message."