A while back we covered importing 2D CAD data into Autodesk Inventor the legacy route; where you import it while in a sketch and all the geometry comes in as one sketch and you lose that link between it and the CAD file.
So, let's look at how we can do this the new and improved route.
In Inventor start a new part file; then click the "Import" button.
then path to the Autocad file that you are wanting to import for use. Once you have selected the dtawing file select a reference plane for the sketch.
then select the center point for the 0,0 point of the autocad file.
Once you have done this then it will place the dwg file as reference into your part file.
Now, from here you can create a sketch and start projecting the Autocad geometry to create a solid part.