richl’s solution is not supported by Tiller but the Tiller Budget that does use envelope/zero sum style budgeting is. The link you pointed to, Docs: Envelope Budget, is the setup guide for that. If you could provide more information about where in the instructions you had trouble it would help figure out what’s wrong. If it’s the “unable to install another budget” error you mentioned it’s because you tried loading it into a sheet with the Foundations budget setup, rather than the sheet in Step 1 under Part 1 of that guide.