The only things you can do with collections on the T1 is create them,delete them add/remove content, sort the view by date ,title, author, there is no such thing as nested collections or linked collections or any other sort of organization if you are using calibre to manage/xfer books then individual unique tags will become collections, there is no physical analogue to collections they are virtual. given the sort capabilities and the search function I am at a loss to understand why you would NEED such a complex organization as opposed to wanting it as a preference. of course, in either case you are SOL as far as the t1 is concerned