Currently Concourse just has a flat set of pipelines. With the upcoming teams feature adding multitenancy, this will at least let them be divvied up between owners, but sometimes it's still nice to have a tree-style organization, if you've got a lot of them, or if they're dynamically configured (e.g. one per branch of a repo).

I think this can be done simply by allowing something like fly set-pipeline -p foo/bar/baz and having the new navigation scheme respect that.