Move expense entries

Is it one expense or many?  Pull up the entry whether a bill or a check and change the account number to which it was originally booked.  If there are too many then you can book a journal entry moving the amount to the correct account number (debit) from the incorrect account number (credit).  Also in the 2010 training session we learned that through the client data review in premier acct you can make "batch reclass" entries.  Hope this helps.  More specific info and I can let you know which option is best for your situation.