301 Redirects in Netsuite

We recently realized that some of our categories and product do not use the best keyword term as the title.  We would like to rename these categories and items but this would mean that the url's would all change.  We don't want to lose our organic traction with these pages so we want to do redirect's.  We currently use Netsuite Redirect page where you can manually put the redirect's in one by one but we need to process literally thousands of redirects.  Is there a better way to accomplish this?  Anyways do upload a file to Netsuite with the redirects?