Import from POS - summarise transactions

We currently import transactions from POS to Reckon Accounts but every single transaction from POS is entered in to Accounts as an individual invoice. In a mixed business like ours, there are hundreds of individual transactions processed every day so this really increases the size of the Accounts file. Is there a way for the import to summarise on one invoice in Accounts so instead of 100's of transactions, they come across as one bulk cash sale so that the stock adjusts correctly but it is in summary form? Obviously, anything that isnt a cash sale (i.e. account sale) would still need to import separately. Any assistance would be appreciated.