You mix up collections with tags.
The tags are in your eBooks and when Calibre is adding a new book from there into the library it takes the metadata from these books. As I do not have a T1 I can't say if it is possible to link Sony's collection names directly into Calibre tags. But you can go the other way around and import only one collection in one step, then select all these books in the library and edit the metadata (tags) in one step. Repeat this for all other collections. Quick and easy.
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