I may have just found the answer if you have Enterprise, but not accountant version.
Company at top of screen
scroll down to Accounting Tools
the first option is Reclassify Transactions
enter the dates you want to work with then couble click the name of the account you wish to change. You can change what types you wish to view under the date range.
Place a check by the transactions you want to change then clilck on the Account to at the bottom and select the correct account and or class
Click Reclassify on the bottom right
Botta Bing!!!
