You can create a curve object in Studio on a point cloud by going to Curves>Create Modify Curves.
1) Click on the model to create the curve.
2) Then click on Execute. Depending on the number of control points, you will see an orange line on the model:
3) Next open Curves>Create Curve Object and click OK. You will see a Curves object in the manager tree:
4) Right click on the Curve object and select to Save As IGES.