Since the last answer in this thread it appears things may have changed, at least if you are using Quickbooks Desktop Enterprise or Accountant.

To change the account a batch of checks are drawn on, do the following:

Company | Accounting Tools | Reclassify Transactions

Set the date range to the appropriate interval
Set the View to Balance Sheet Accounts
Find the account where the checks are currently drawn from
Use the Name filter to help narrow down the transactions if possible or necessary
Select the checks that you want to change
Select "Account to:" and then select the account you want the checks to be drawn against
Click "Reclassify"