afterbirth

Ok, a new question:

I just got an IPOD.
I was importing songs from albums via Itunes.
No biggie.
But now I'm uploading the Clash, and they had a bunch of stuff on different compilations (along with the 3 good songs from Combat Rock) that I want to combine into a sort of "Greatest Hits" playlist or folder.
After I uploaded them into Itunes I went to the folders and put all the stray songs into one folder. I renumbered the songs.
Then I uploaded everything to my IPOD. The complete albums were fine, but the compliations didn't show up at all.

Should I not be doing this through Itunes?
Should I just upload everything to the IPOD and THEN arrange things?

Anyone know or care?