Tom, unfortunately I've had to load one by one. I have over 1.3 million on my sportlots account, so I bring up a tab for sportlots, with the set I want to load and a tab for tcdb and load one by one. It's a cumbersome system, not conducive for large collections. I have over 50 copies of some cards, but you have to do two steps to add multiple, and can only add 10 at a time. So to add 50 cards, it takes it takes 6 steps. If it was like sporlots, add up to 99 in one step, it would save a ton of time. Takes 30 minutes to load 200-300 cards.
Good luck and happy trading!
BobbyL