I've got more than one person downloading apps to my iTunes, and so I'd like to list all apps purchased by one account (meaning the same email address). How can I separate apps like this? I can't seem to find any columns that I can add to the Apps tab to sort apps in this way.
Currently there is no way to sort them in mass, you could one-by-one right click on each app, select 'Get Info' and then a window will pop up with app info.
Under the summary tab you will see (middle right hand side of the window) 'Purchased By' and 'Account Name'.
Sorry but that's currently the only way. Unless your on a Mac and can code a shell script.
You can try in Terminal.
Here is a blogpost where this action is explained.