Where does PRS+ get the folder information?
If it gets it from the folders on the device's file system, then use the save template to construct whatever folder hierarchy you want from book metadata. My guess is that you will want to use some custom columns to indicate where books should go. If the same book can go in multiple folders, then more than one copy of the book will be on the device (general problem with filesystem organization).
If PRS+ gets folder information from some internal database, then no, calibre won't use them
Regarding collections: the sony does not support hierarchical collections, so calibre doesn't. You can make collection names that look hierarchical (tech.databases, tech.programming), but you won't be able to open and close them.
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