Attached Link: http://www.hogsoft.com/

Hogsoft has a utility for Poser 4 called "PBooost" which enables you to use multiple sets of folders. You cannot directly nest folders in Poser 4. ( To delete Pose files you only need to remove the individual folder. However if they are MAT pose files then you would also want to remove the associated texture folders if you're not going to want to use them any more. I never managed to take my old Poser 4 over 256 folders so I'm not exactly sure what happens when you exceed that limit, but I believe Poser starts to cut off parts of the filenames or not show folders at all. (This limitation was removed in poser 5 which allows multiple runtimes and nested folders. Yay!)

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire