Selecting/Deselecting songs

I want to use the auto update function for importing iTunes songs to my iPod, but I thought that when I uncheck the square blue box it means the song wont be imported. But that doesnt work, and every single song from my library is imported even if the box is unchecked. I dont want to manually go through every time. Anyway to not select certain songs while still using the auto update?

go to the iPods preferences at the bottom right of iTunes when it is connected and there should be an option to update only those songs selected