To define the stock using a solid

1. Right-click the stock in the Part View and select Properties.
2. On the Dimensions tab of the Stock Properties dialog, select User-defined.
3. Click Stock Solid.

   A list of solids is displayed. To display all solids in the model, select Show all.

4. Select a solid in the list, or click Pick Solid and select a solid in the Graphics window.
5. Click OK and Apply to close the dialog and preview the stock in the Graphics window.
6. Click OK to close the dialog.

If you create Side or Boss features when using a stock solid, the toolpaths are trimmed to the stock boundary to prevent air cutting, even when the stock solid has multiple regions.

If you enable the Individual rough levels option, each z-level of the toolpath is trimmed to the stock boundary separately, which further prevents air cutting.