No. If you have already registered for MyCatFinancial to manage your Cat Financial contracts, you will not need to register again to manage your Cat Commercial Account.
Once your new account is active, just log in to your existing account on mycatfinancial.com, and click the Link Cat Commercial Account button. You will need your account name and 16-digit corporate account number. Once your account is linked, you will be able to manage both your contracts and Cat Commercial Account in MyCatFinancial. Please note that this functionality will not be available until your new Cat Commercial Account is active.