Setup bank account using bank statement parser

Hi, I currently have bank accounts setup in Netsuite and for few banks, bank statement is imported manually and for few bank statement is imported automatically by using bank statement parser suite app. Now I would like setup automatic bank statement import for existing bank accounts that currently being imported manually. My question is once I setup the new bank account using bank statement parser, will this bring all transactions again that were previously imported manually and reconciled. How do we only bring transactions from a certain date once I setup, because I have already reconciled bank transactions from all