Possible to delete folders within a filespace?

[Angus Macdonald]

One of my users has spent a lot of time copying huge amounts of data within one 
of my servers, with the result that I have backed up about 3.5TB of files I 
don't need. The copies have gone from the server but will remain on my Tivoli 
system for the next year (retonly=365). Is it possible to delete specific 
folders within a filespace? I would prefer not to change my retonly parameter 
unless that's the only way to get rid of this data.
Thanks
Angus