Yes. When filling out your bank account information, you may click the “Save as Default for... link under the account number field. Once you confirm, you may select the saved bank account information for all future payments on that account.
You can also set this up in under “My Profile.” In the “I Want To” section, select “Manage Payment Channels,” then click on “Add.” Enter your banking information as prompted.
You can add as many bank accounts as you like