Union
The "Union" function can create a new feature which is the union area of two or more than two features. First of all, click "Start Editing", select the target layer, and click "Select Features" tool. Then, click the features you would like to combine to a new feature and click "Union" in "Start Editing" menu. Thus, a new feature of the combined area is created.
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NOTE: As the new feature is created, the new feature will cover the original feature. You need to move the feature to the desired location by mouse. Besides, the attributes of the new feature will be added in the attribute table but not copy the original features, so the attribute value is blank.
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