Bodies to Keep
The Bodies to Keep dialog box appears with the any cut feature that affects multiple bodies in multibody parts. It allows you to select which bodies to keep and which bodies to eliminate as a result of the cut operation.
You can choose All bodies or Selected bodies. If the model has configurations, you can select the configurations to affect.
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All bodies. Keeps all bodies created by the cut every time the feature rebuilds. If you add new bodies to the model that are intersected by the cutting tool, these new bodies are also rebuilt to include the cut.
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Selected bodies. Keeps only the bodies you select using the pointer 
that appears after choose Selected bodies. If you add new bodies to the model that are intersected by the cutting tool, you need to use Edit Feature to select those bodies, and to add them to the list of selected bodies. If you do not add the new bodies to the list of selected bodies, they remain intact.
The solid bodies you select are highlighted in the graphics area and listed in the Feature Scope box.
of cut features with bodies to keep
To keep all bodies:
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In the PropertyManager, under Feature Scope, select All bodies.
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Click 
.
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Click OK in the dialog box.
To keep selected bodies:
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In the PropertyManager, under Feature Scope, choose Selected bodies and clear Auto-select.
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Use the pointer to select the bodies to keep and to list your choices for Solid Bodies to Affect 
.
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Click .
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Click OK in the dialog box.
Using Auto-Select
The Auto-select option is selected by default, and is available only if you choose Selected bodies. When you first create a model with multibody parts, the cutting tool automatically processes all the relevant intersecting parts. The Auto-select option is faster than the All bodies option, since it processes only the bodies on the initial list and does not rebuild the entire model.
To keep selected bodies and use Auto-select:
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In the PropertyManager, under Feature Scope, choose Selected bodies and Auto-select.
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Click .
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Click OK in the dialog box.