Hi zlamushka , I did not forget about your request, however yesterday I left the job by midnight and really did not have time for this. However I also found a page doing something similar, but the articles were also listed in both categories...for example a post labeled with "internet" & with "business" is listed both under internet and business, but in that case it makes sense.
However it seems to me that the way to go for the moment is how you already did it, that means listing the labels directly.

That way an article labeles Curry Pastes, Thai would appear under both cathegories. I don't know if you can further group the labels manually, it would be nice to have two main categories and then detail them....but I'm afraid you should do this manually.

All best,
Radu