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From the Label Tool window, click the General tab.
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Choose an attribute from the Attribute list box.
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Type a name for the labels in the Label set name box.
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To label only the shapes that you have selected in the layer, select Label selected shapes only. Clear the check mark to label all the shapes in the layer.
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To clear existing labels and relabel the shapes in the layer, select Overwrite existing labels. Clear the check mark to label only the unlabelled shapes. If you selected Label selected shapes only in the previous step, only the shapes that you have selected are relabeled.
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To display NoData as a label for records containing null values or lacking data, select Include NoData. Clear the check mark to hide the NoData labels.
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Click OK.