A hierarchical process

Let's say we have a system that you can module a process and track its status and currently running tasks. 1. The process has a top level groups name stages 2. Each stage can contain groups (no more than two nested groups) 3. Each stage or group can contain one or more tasks running in a sequential or parallel manner

What view would you use for creating such process: board, left pane tree + main grid, tree grid or other?

Adding a sketch and additional information: