BUGS.csv
BugID,Date,Subject,Priority
9551,03/01/2008,This is the subject,1
9552,03/03/2008,This is the subject,2
9553,03/06/2008,This is the subject,1
9554,03/07/2008,This is the subject,0
9555,03/08/2008,This is the subject,5

##</code><code>##

BUG_Comments.csv
CommentId, BugId, Date, CommentBody
1023,9555,03/06/2008,This is the body
1024,9555,03/07/2008,This is the body
1025,9555,03/08/2008,This is the body

##</code><code>##

WANTED:
BUG_Comments_COMBINED.csv
BugId, CommentBody
9555,"03/06/2008 This is the body 03/07/2008 This is the body 03/08/2008 This is the body"