Multiple instances of Subitems

I would like the ability to have multiple instances of Subitems for individual tasks. For example: my team has a list of projects with a lot of top-level info that only needs to be stated once (client, budget, overall plan document, etc). But we also have lists of different kinds of relevant info that needs to be easily accessible, like a materials list, people who need to be contacted, “next steps”, etc.

We would like all this info on one board, so that we can look at all our current projects at once for an overview of what’s going on, and keep track of details (like individual expenses for individual projects, or what exactly has to happen next for a particular project) in subitems.

This would be very easy with multiple columns of subitems, but without them I’m struggling to figure out how to structure my board.