You can define the raw stock model as a bounding box of the XYZ extents of geometry of the part model. You can then define offsets in any of the three coordinate directions to apply to the computed bounding box.
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click: 
 G-Code Browser: Part Box Stock menu item |
The system calculates the bounding box of the part model as the XYZ extents of geometry of the part model. You can then define offsets in any of the three coordinate directions to apply to the computed bounding box. The system will expand the bounding box by the offset amount in each of the coordinate directions. When you click on the OK button, a stock model based on your definition will be created and displayed.  Dialog Box: Part Box Stock |
Check this to ignore all 2D and 3D curve geometries present in the part from stock bounding box computation.
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