problem with linking data
 

I have a transaction file for a number of the accounts in .CSV generated
daily from the bank. I need to import it to a cash report that is separating
the transactions into proper accounts. Thus each account has a separate
workbook. To link the data for a number of the transations is easy. The
problem however is that some days have a lot of activity, others only a few.
How to link the transaction file to one cell in my report so that when
excecuting the formula, it would display all the transactions for that
particular account, whether they are many or few? Is it even possible?
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Sergei D