How to create multiple save files for one game and where to store the files?

So, I’ve been thinking of creating multiple save files for games like Pokémon and SMT, but I don’t know how to do it exactly. Additionally, even if I do manage to create the save file, how can I switch between them whenever I want to go back to an old one? I’ve heard about copying my original save file data and storing the copy in a separate folder, but should the folder be somewhere else in the Citra folder, does it have to be outside of it, or can it just be anywhere else?