M_Skrz_22, Thanks for the suggestion, there's no easy way to do it. I'll probably just create the "for trade" collection of one card each, then go through the main collection and delete one of each. Still cumbersome and time consuming, but I see no way to extract one of each.
There are several things I'd love to see added to the "add inventory" process. A total number of cards added, with the date they were added would be nice, especially if you buy collections and add different lots of the same set. Having the total # of each card, beside the card number. Higher numbers in the "multiple cards" added. If you add 40 of the same card, you have to hit 10, 4 times. I've had occasions when the system was slow, that it didn't add the right amount.
Thanks again for the response.