Hi, ana,

If I absolutely could not get it done in one pass, I'd use modes for this, 
as Mark Lundquist pointed out.

However, it may be easier to do this as one pass than you might think. As 
Michael Kay has oft pointed out, you can write the results of your first 
transformation into a variable and then process the contents of the 
variable, giving you complete processing in one pass. I use that technique 
for a number of tasks, the largest of which is generating indexes for 
books.

HTH

Jay Bryant
Bryant Communication Services
(on contract at Synergistic Solution Technologies)