Just getting myself spun up with Johnny.Decimal. I’m still in the phase of building out my own Johnny.Decimal system. (I’m an academic, so I’ve been looking at patterns here.)
Though I don’t do GTD, I use the 00 files in my day job: 30.02 Work in progress. I found that on the site, so I used what was there. I date the folders within with the date the suspense is due, so 2025-03-08 Unsubmitted Vouchers. I save the email from the suspense in there and when I submit it (because sometimes the other office messes up). Then the folder moves into another JD folder called Suspenses. Because the WIP folder may not only contain suspenses, though it mostly does.