I've seen software specifically made to tackle such complex processes and they were buggy as hell. And I've seen 100+ connected Excel spreadsheets managing $500M+ yearly transactions of the buying department of a white goods manufacturer, it was a work of art.
Why would anyone do that? There are much better tools for handling complexity on that level. That's insane.
Two words: Corporate IT.
Another two: Onboarding Process.
I didn't realise you could connect spreadsheets together. Thanks for new knowledge!