Deleting songs from iTunes but keeping on iPod
I am running out of space on my Macbook (OS 10.4.11). It is mainly because most of my memory is being taken up by my iTunes library (I have over 24,000 songs) They are already on my iPod, so I would like to delete most of the songs from my computer (have them backed up on an external drive also). But I don't want to lose them on my ipod. What do I need to do to be able to delete certain songs from my computer but keep them on my ipod.
Thanks!
MacBook, Mac OS X (10.4.11), ipod classic 160 GB