What's New: Creo Parametric 4.0 > Part Modeling (Sketcher, Part, Creo Flexible Modeling) > Smart Removal of Shapes in Creo Flexible Modeling
  
Smart Removal of Shapes in Creo Flexible Modeling
Bleeding surface detection when using the Remove tool provides smarter removal of geometry shapes.
Click Flexible Modeling > Remove.
Release: Creo Parametric 4.0
Benefits and Description
You can watch a video that demonstrates this capability.
The Auto split shape surfaces check box is available in the Remove tool. When this check box is selected, there is an evaluation of the selected surfaces to detect if they form a shape such as a boss that contains a bleeding (overhang) surface. If such a surface is found, then a special treatment is applied to split that surface. In previous releases, the remove operation may have failed in those cases where the geometry could not be closed to a solid. In Creo Parametric 4.0 when the Auto split shape surfaces check box is selected, the tool automatically splits the bleeding surface, so that the shape can be removed seamlessly.
This is particularly useful when you use the Remove in combination with shape selection or with queries based on the Geometry Search tool. When combined, these capabilities increase efficiency when defeaturing a model.