this may work...

get your CO confirmation number.

i was told that even though you purchased the ticket from someone else, and it was issued by another airline, that you still have a mirror record in CO's system. if you can get that confirmation number, you may be able to find your res. at co.com using your conf. number and your last name.

if it works, there should be a link that will allow you to split everyone off individually. im not sure if this will jeapordize the air eurpoa portion, but it may work for you.