It is not recommended to do this since it will make EW slower having to retrieve those files from an external drive when needed, but saying that, you can do it. You would have to do it manually. Put your files on your external drive and then manually create shortcuts to the files and cut and paste the shortcuts and put them in the resources folders in EW. The default location is C:\Users\Public\Documents\Softouch\EasyWorship\Default\Resources