Modifications to the HVAC duct system that either involve altering the existing ducts, or extending the ducts more than 40 feet require that the project be registered with a HERS provided. The simplified Addition and Alteration methods allow for no registration, and as such cannot be used in this case. Your options would be to use the Performance Approach (which will still requires registration) or indicate the ducts are not being altered, and then submit a separate document via a HERS provider (see www.cheers2016.org) for the duct alterations in addition to the envelope documents prepared in EnergyPro.
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