How to sort videos into folders? How can I sort videos into folders/categories using iTunes ?

I've tried adding info to the sorting field tab when I click on 'Get Info' after right clicking on the video itself. But the videos always appear in a list on my iPhone. I just want to nest some videos into folders. How can I do this ?
You can sort your movies into Genres, that is the only way I have found to sort of make a subfolder.