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Old 09-24-2014, 03:36 AM   #4
chaley
Grand Sorcerer
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Posts: 12,345
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Join Date: Jan 2010
Location: Notts, England
Device: Kobo Libra 2
This feature is on the wish list already and has been for some time. Unfortunately it is hard to do. When I built hierarchical columns in calibre it took me weeks to make it work, and that was with having no memory or CPU constraints.

I am still thinking about alternate approaches that might make it practical in CC.
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