To set up the opening creditors you would go through the creditors module and go through each account and set up using the O/B function. The other side of the double entry will automatically be debited to the suspense account.
When you posted your opening trial balance then you would have posted an amount fo the total of the creditors as a credit balance. This should be credited to the suspense account to match the debit that has resulted from you posting the creditors individually.
The same should be done for debtors but obviously the other side of the double entry will be a credit to the supsense account which should be cancelled by the debit balance in your debtors total in your opening trial balance.
