Use the Part tool to identify the cavity.
Note: You must select a preform material before you can assign it in the cavity
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From the Resin Transfer Molding ribbon, click the
Part tool.
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Select the part cavity.
You can select cavities one at a time, or you can box select multiple cavities
at once.
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In the microdialog that appears, select the material for the part from the
preform materials that you specified using the Materials tool.
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Right-click and mouse through the check mark to exit, or double-right-click.