If you made changes in the geometry and SURFCAM can select the new geometry, the following box is displayed.

Then the Chaining Preview is displayed in the SURFCAM window. The SURFCAM generated chains are highlighted.
Then the Auto Chaining Preview menu is displayed.
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Part Chains/Material
Chains
These commands are toggle buttons. If you chained material and the part, you can toggle between the two commands. Click the Part Chains command to highlight the part contour. Click the Material Chains command to highlight the material contour.
Side Point
If you click a pocket or click on the side of a contour, the point you click is a Side Point. This command toggles the display of the Side Points. A square indicates the location of a Side Point.
Continue Regeneration
Click this command to continue to Regenerate the toolpath with the saved geometry.
Reselect Chains
Click this command to display the dialog box. After you click OK, a prompt asks you to select the beginning element of a new chain.