CNCSimulator Pro

user guide
Index Facing

Facing is used to remove material from the end of the workpiece to create a flat surface. You do not need to create a contour on a Facing layer. You need to add two point that defines the "operation window". If you are not sure on how to do that, please read about it under roughing.
There is no dedicated tab for facing in the Cutting Operation Parameters dialog.
You use the Standard parameters to decide cutting depth and retraction for the operation. The two points on the layer decides where the operation should start and end.