Create a curve at the intersection of two unique sets of objects.
Open file Intersection_Curve_Model.prt.
Select Curve tab > Derived Curve group > Intersection Curve to display the Intersection Curve dialog.
The Select Face selection step in the Set 1 pane should be highlighted. In the Graphics window, pick the first face to intersect as shown in the image below.
Select the Select Face selection step in the Set 2 pane.
In the Graphics window, pick the second face to intersect as shown in the image below.
click OK create the intersection curve.
Select both Extrude features in the Part Navigator, right-click and select Hide from the pop-up menu to see the created intersection curve.