When working with 3D CAD files in the Process Definition window, you use the Nav Cube control to move and rotate the image. The Nav Cube control shows you the assembly faces (Top, Bottom, Left, Right, Back, and Front).
Position the cursor on the Nav Cube control. Notice the blue square that moves as you move the cursor. Select the following link to view a short video that shows the Cube control in action.
Click an assembly face on the Nav Cube control (Top, Bottom, Left, Right, Back, and Front) to reorient the assembly.