How do I sync multiple iPods to the same iTunes Library?
How can I sync multiple iPods to the same iTunes Library?
iPod touch
How can I sync multiple iPods to the same iTunes Library?
iPod touch
The same way you sync just one. If y want different media on each iPod then only select the items you want synced to each iPod
iTunes: Syncing media content to iOS devices and iPod
Try syncing using the manual method
Managing content manually on iPhone, iPad, and iPod
Also, I would go to iTunes>Preferences>Devices and check the box that says prevent iPods... for syncing automatically so that you can more easily check what you want syned
How do I sync multiple iPods to the same iTunes Library?