Groupings and hierarchies are graphs.
Try Gephi - it can import from database, edit graphs from scratch, export to various text formats, starting from CSV.
You will have to write import routines from text graph formats to database. Explore formats wisely with this in mind.
Also you may need to do some temporary tables and UPDATE JOIN, since Gephi (and likely other graph software) only can have ID (from DB) and label (name + some crucial attributes) in graphs, graph nodes are not records.