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Aggregation of multiple files

Let's start with the usual workcase study3 / 4
XStorewide sales_October.xlsm - Excel
FileHomeInsertPage LayoutFormulasDataReviewViewDeveloperHelp
A1Branch
ABCD
1BranchProductSales (yen)
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📁Tokyo_October.xlsxOsaka_October.xlsxFukuoka_October.xlsx
tallyReady
Mauchu

KeyCat

This month's sales have arrived from Tokyo, Osaka, and Fukuoka. Let's summarize it in one summary table.

This is an operation image using fictitious data. Saving and printing are reproductions of what is on the screen. It does not manipulate actual files or printers. Processing speed is a matter of performance.

This is an exercise that reproduces the Windows version of Excel. The keys on the ribbon differ depending on the display language, so you can also use the buttons on the screen. On Mac, open VBE with Option+F11. Depending on your keyboard settings, you may also need the Fn key. The VBA syntax and the function name passed to .Formula remain in English.