Saving Purchased ringtones to add to new phone
I have several ringtones that I purchased, on my iPhone 6. I want to make sure I save them properly to iTunes so that when I get my new iPhone I can then transfer them to the new phone. What's the correct process to do this? I have the latest software update on my iPhone 6 as well as on my MacBook air. Thank you.
iPhone 6, iOS 9.0.2, Michy 6