Le Renard

I am having trouble adjusting which columns I see in folders. Under my "SENT ITEMS" folder I have subdivided it into different years. The regular SENT ITEMS folder has the correct columns in it: to, sent, subject, etc. However, the subfolders in SENT ITEMS use the columns I have for my INBOX: from, received, etc. If I change the columns in the subfolders in SENT ITEMS it changes the columns in my INBOX to the same. How can I get these subfolders in SENT ITEMS to have the columns I want and to not change my INBOX columns??? Thanks!