[onceKnowable]

Google Docs & Apple’s ICloud both have cloud based excel sheet equivalents that can allow multiple people to edit simultaneously and also track who made what changes.

If you did this with git, it’d have to be text based so a CSV textile that could be exported to an excel doc whenever needed, would be the closest you could get. Good luck teaching your team how to use the command line though :)

You might be better to redirect your effort into lobbying your boss to use software that’s actually designed for project management such as Trello?