So I'm just restarting modding (after 2 years) and I completely forgot how to add items to the drop tables. Any help?

Um, I've never heard of these drop tables. Care to elaborate?

i think here's talking about levelled lists......aka things that get generated in inventories, which he then kills to get items.

Yeah, my bad. What I mean is the leveled items list. Is that just a quick CS edit of one of the leveled items objects?

Yeah, just double click on the levelled item you want to change, find the item you want to add in the items window and drag it in.