With the Trim custom command, you can trim open and closed elements to a point in space, to a point on another element, or perform a partial delete on a section of the element itself.
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Click Tools > Custom Commands.
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In the Custom Commands dialog box, navigate to <Product Directory>:\Program and click igrTrim412.ocx.
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Click Open.
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On the Trim ribbon, select the type of trim you want to perform.
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On the Trim ribbon, select a trim method.
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In the SmartSketch Drawing Editor drawing, select an element to trim.
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Follow the prompts in the Status bar to trim the selected element.