I see from other posts this looks like it was addressed in the past but cant figure it out on the webpage. Can you add a complete precon commander deck to your collection or do you need to add the cards 1x1?
Yes, but where do you find the accurate card lists of specific decks. Until now, the decks available online always present mistakes. At the end, it is often easier to add cards 1 x 1, unfortunately. Which website are you using for your decks imports?
You can import decks from the decks page (button at the bottom right)