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Click Dimension Text
on the Dimension toolbar.
If the Dimension toolbar is not displayed, click Dimension 
on the Main toolbar.
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Select the driven dimension you want to override.
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In the Dimension Text field on the Dimension Text ribbon, type the text that will override the dimension.
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Press ENTER on the keyboard.
If you select a driving dimension instead of a driven dimension, SmartSketch prompts you either to select another dimension or to right-click and exit the command.