You mentioned two way of entrering cards but on the cardset page there is a third way, the fast entry page, there is a link on top right of the cardset page. Mainly this list only number of cards and each time you click a number it will up the quantity by one. Those are the three way to add cards. It's not possible to use the check box on inventory item that does not exist because all action are base on unique inventory numbers. When I list a card set, I read really two tables. The card table and for each entry I look at the inventory table to see if I have a matching entry of yours. If not then no check box will show. The reason is that I can't perform action based on both tables. I need to pick either one. This is because to each check box, the unique inventory number is attach to it and then the selected action tell me what to perform for each entry. Since cards you have no entry have no unique inventory number I can't perform action on these. If I would attach the unique card number then I could not perform action base on the inventory table. I could add cards but would not know if you have any or perform delete action or other action. SO no this is not possible via check box at the current time with the current code. But try the fast entry page, work well just to add cards.
