What are you expecting then to put under 'Album'? If you are looking for organization tips you can set your iTunes view options to show 'Groups'. Otherwise there is no easy way to do this.
The hard way, and I'm just thinking this never done, would be to go into your iTunes XML file and do a search and replace of album and groups. Though This would require some high attention to detail and is not guaranteed to work. Make a backup of the XML file if you do feel the need to try.
What is the grouping area used for?
Grouping songs together? Why does it matter?
Maybe he is curious. Obviously Grouping has something to do with groups.... but that is pretty vague.
Is it sort of like a multi-disc set? So.... Disc 1 and Disc 2 would be of the same group?
Well, I've got a huge amount of mp3's that have the grouping and album reversed. The grouping needs to be the album and the album needs to be the grouping.
I thought this could be done with automator or applescript. All it needs to do is select the song, 'Get Info' copy the Grouping field and paste it into the Album field. Then replace the old grouping(in the grouping field) with Disney's Hollywood Studio.