ACH Payments and Bank Reconciliation

When you process ACH payments through AP Paycycle Manager, when you load the BAI2 file from the bank to perform the bank reconciliation what BAI code is assigned to the transactions for the payment and return when you import the bank statement from the bank. Is the ACH payments usually in detail or is it a one payment representing several for several payments. How do people normally reconcile ACH payments? Do they use Automatic Recon and than use Semi Manual to reconcile the ACH payments. Do the ACH returns display in the BAI2 file from the bank. Any help would