I'd like to copy all the flashcards that I've reviewed since [certain time] in a new category by themselves. Any advice on how I can do this very much appreciated, thanks.
With
Flashcards / Search Cards / first reviewed / [date] / Search Now
you should get the cards you want to copy, with
Edit / Batch / /[Select a Category] / Add cards to category
they will be copied to the category you selected.