You can use IMX datasets to exchange data with InfraWorks.
You can use the workflow described in To Bring Autodesk InfraWorks Data into Autodesk Civil 3D to bring an IMX dataset into Civil 3D.
For more information, see To Bring Autodesk InfraWorks Data into Autodesk Civil 3D.
You can also use the following command:
The dataset is saved using the naming format <drawing name>.imx in the specified folder.