Plaese add subject lines to your messages in the future
It is hard to get a sense of what you need ... But if you don't need the
list to be interactive (that's what I understood you to mean when you said
you didn't need "folding", just use intentation of one of your columns to
show the heirarchical relationships that it sounds like you require. Why do
you need any convention here other than the list itself? I'm sure I'm
missing something, maybe you can elaborate on the requirement more?