exporting selected contacts for one group contact

For a friend: I'd like to take selected contacts from an aol account and make one group contact in a comcast email account. I know I can export selected email contacts in aol in csv, txt, or ldif format but I'm not sure how to import that to make one group contact in comcast or any other account for that matter.

Thanks

I was able to export contacts selectively from AOL and create a group contact in Gmail so I suspect I'll be able to that in comcast when I get the chance.

Thanks.