Debit a 'Checking Account' Only

[b4wt]

I have created a expenses account and made lot of entires with "Imbalance"
as the debit account [ Probably another newbie mistake ]. Now i want all
these entries to be debited from another account say 'Checking Account'

Is there any simpler way of doing this rather than manually modifying each
transaction, Say all transactions under this account debit from 'Checking
Account'