Editing an Existing Feature
To edit an existing feature within the boundary layer, follow these steps:
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Click the Start button. The ArcMap editor tool bar will become active.
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Select the feature that needs to be edited and double click on it.
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The vertices of the polygon will become editable.

Fig.157: Editing feature using Tool option
Fig.157: Editing feature using Tool option
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You can move the existing vertices, add new vertices, or remove vertices as needed.
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You can also utilize the available editing tools such as Reshape Feature , Cut Polygon , Rotate , and Sketch Properties to make the desired changes to the feature.