Hi Kent,
There is a (quite old) discussion on handling heirarchical or bill-of-materials (BOM) type queries in the International Sybase Users Group FAQ collection. See Sybase FAQ §6.2: SQL Advanced. There haven't been any fancy new commands added to ASE to make it easier since.
There is also a book by Joe Celko on the subject, "Joe Celko's Trees and Hierarchies in SQL for Smarties", ISBN 9781558609204. I got a copy a week ago and have just started reading it so can't actually say how helpful it will be, but I generally do find his books helpful.
-bret