Yes. Additional principal payments can be drafted on each draft along with your regular payment.
You can also schedule a one-time principal payment after your regular draft by visiting the Make a Payment section under Payment. The amount will automatically draft from your bank account. You can also make additional principal payments by check. You can mail a mortgage or HELOC additional principal payment to the processing center listed below:
Payment Processing
PO Box 660093
Dallas, TX 75266-0093