I see you've misunderstood my post. What I mean is that you can categorize your print when you upload them into the gallery. My suggestion is to categorize them as available for a print exchange. When you do that, Sean has created a filter for all prints available for an exchange so you can see them in one gallery. You can categorize as many prints as you want as available for a print exchange. Plus you can change your categorization at any time too.
Hope that explains it better.