Create rip relief in mitered corners so it can be flattened.

Hello community,

Am looking to see if possible to create a flat pattern of a model with rips defined in the mitered corners of flange walls around miter cuts as shown

The above is being created by manually modifying the drawing to achieve the required result from the following

Is this possible using features within Sheetmetal mode?  Have attached a sample model from Creo2 to represent this.

Thanks in advance

  Andrew Hanson