Once you have your video files added to the Itunes Film library, select all the videos for the the series you are looking to pair together, for instance the six videos of The IT Crowd Season 2.
Right click and select 'Get Info', agree to update multiple videos at one time, under the Video tab put the program name and the season number as you see fit.
Next go to the Options tab, and go to the Media Kind drop down and select TV Programme.
That'll transfer the videos to TV Programmes and also pair them all up by whatever you put in the Video tab section.
I.T. Tips from fergus.it