Hi Raam,
When you model a photovoltaic system plane-of-array (POA) weather data, SAM uses a decomposition model to calculate the direct normal irradiance (DNI) and diffuse horizontal irradiance (DHI) components from the POA irradiance and sun position angles. It reports those calculated values in the results as "Irradiance DHI calculated" and "Irradiance DNI calculated."
You can export that data to use in other models, but as always, be clear about the source of your data when you present results using this data.
Best regards,
Paul.