Once you connect the external, can you not simply open it, and remove what you don't want without DLing to your PC?
Once you remove all extraneous material, iTunes can be set as your default audio player. Then all you have to do is click on a music file, and iTunes will open and play it, adding it to the iTunes menu. The data does not move from the external, it duplicates in iTunes (I think) and you can remove it from iTunes anytime you want without losing the external drive files. This is how I have a TON of audio material stored, works great.
watchurai wrote: