Why can't I add TV shows to ipod without wiping every thing else out?

Question

I'm a newby so forgive me. But I've already lost all the apps I purchased for my ipod because I wanted to update my music library (transferring from macbook pro itunes to my ipod touch). It said to do so would wipe out all my apps. I said yes thinking I could go back and add the apps later—because I still "see" them in itunes. But when I tried to select and transfer the apps they're all grayed out! I can't find a way to select and reinstall them. Same with tv shows purchased on itunes: I want to put them on my ipod but it says to do so will wipe out my entire music library. At least it gives me an option to select those unlike the apps. How frustrating! It seems I can't add one thing without entirely wiping out another.

Answer 1

Yes. Same computer. Yes. The computer is authorized. I am able to move my music to the iPod so assume it's signed in to the account. The iPod actually came with the Computer. It has never been synced to other computer. Am I just doing something wrong? Why can't it update my music library without copying over my apps? Why can't it add the tv shows i bought without erasing all my music in the process. And finally, I see ghosts of the apps I used to have installed on my iPod in iTunes but iTunes won't let me selected them to move them back to the iPod.