Sorry for my bad English, I am Brazilian and only know how to read but not how to write XD. So, I recently finish the defaults decks of the core 2000(step 1, step 2 etc), but I don't like how the fist step of the core 6000 is organized, and I am fed up with business and political things. So I leaned of the nukemarine deck and want to try it, but I don't want to do the 2000 words of the previously decks, what I do?

One thing you could do is suspend all the cards in Core 6000 which you have already learned in Core 2000.

This might work:

1. Tag all your Core2000 cards "Core2000"
2. Export your Core2000 deck as text file
3. Import your Core2000 cards into Core6000 deck. Import ONLY the "Expression" field + "Tag" field (choose "Update existing notes when first field matches")
4. Delete all cards in Core6000 deck that have "Core2000" tag
5. Yay!