editing tradelist

When I first created my account my intentions were to sell or trade my collection and let anybody see what cards I had so I had all my cards available for trade. I started with a free account and I had columns to list inventory and trade counts in my decks. I have since upgraded to a premium account and that feature is gone. I have 25 decks made and a few deck ideas. Now I am going thru and clicking on each individual card then inventory/ trade list then changing the values to 0 for every card. There has to be an easier way to get this done. Can anyone help me out?