Different Error files according to a column

Hello, 

I have a lookup data flow transformation, it is according to one column of the source agains a table (basically if exist)

now, I have that if found, go to one step, but if not found goes to a text file. 

the thing is that this process create me huge files (arround 1.4 Gig), so I would like to create an error file per each different not found case. 

For example, the process came with transaccions of several branches, the lookup find the country of the branch, but if not found the branch number 99, create a file for only transaccions for this branch, and one file per branch not found.