You can create remachining toolpaths that automatically mill regions that were not cut by previous operations.
There are several types of remachining:
This is Parallel, Z finish, or 3D spiral operations with the Remachining option enabled in the Remachining dialog.
You specify the diameter of the previous tool that was used to cut the part and FeatureCAM automatically determines the uncut regions and applies a toolpath to them.
Corner remachining is used to clean up corners that occur between non-tangential surfaces. You can specify the whether the tool cuts across or along the trace lines.
Pencil milling is a single-line toolpath used to clean up corners and fillets.