Organizing video files in iTunes is easy if you set a few preferences and add information to video files after they are imported into iTunes. Follow these steps and you'll have a well-organized video library in iTunes.
1. Open the iTunes Preferences Pane and select the
General tab. Put a check in the boxes in front of:
Movies
TV Shows
Show genre when
browsing
Group compilations
when browsing

2. Select the Advanced tab and then the General tab on the Advanced Pane. Select the location for your iTunes library by clicking the Change... button and locating and selecting the folder or drive you want to use. You can skip this step if you are satisfied with the current location of your iTunes folder.
3. Put a check in the boxes in front of:
Keep iTunes Music
folder organized
Copy files to iTunes
Music folder when adding to library

4. Create a Smart playlist with one criteria - "Date Added is [today's date]." This will make locating your new video files easy. Make sure you put a check in the box in front of Live updating.

5. Select "Add to Library..." from the File menu and locate and select the video files you want to add to iTunes.
6. All your new video files will be in the Smart folder you created in Step 4. Label similar files with the same genre by selecting the files, pressing Command-I, selecting the Info tab, and selecting the genre from the drop-down menu in the lower left corner of the pane.
7. Complete as much information as you can on the Info pane for each individual file.

8. If you have TV shows, select the Video tab. Select TV Show from the drop-down menu next to Video Kind and complete the rest of the information on the pane for the file.

Your video files should now be organized and easy to locate and view when you select either Movies or TV Shows at the top of the iTunes window. If you have a video iPod, the videos will also be clearly marked and organized on your iPod.