Prior to importing system data, you can analyze the DDXML file using an external tool. Component sizes are calculated and written to the DDXML file. Once analyzed, you can import the DDXML file into your drawing.
Open the drawing that contains the system for which you exported the system data.
Click Analyze tabHVAC panelImport Duct XML.
In the Duct System XML Import dialog box, specify the DDXML file you want to import, and click Open.
The optimized data is assigned to the system in the drawing.