About editing attributes
When you want to add, delete, or update attribute values, you can use either the Attributes window or the table window.
Editing attributes in the Attributes window
The Attributes window allows you to view and edit attributes of features you have selected. You can open it by clicking the Attributes button 
on the Editor toolbar.
While the window can be reoriented, it is vertical by default. The top of the window lists the features you have selected. Features are listed by their display expression and grouped by layer. Use the Fields tab of the Layer Properties dialog box to customize how the fields appear by setting up field aliases, hiding fields, and changing the field order.
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The bottom of the Attributes window contains two columns: the attribute fields of the layer you are viewing and the values of those attribute properties. The attribute values that appear depend on what you click in the tree at the top.
- To modify a value for a single feature, click the feature and make your changes in the attribute value column.
- To modify values for all selected features in a layer at the same time, click the layer name and make your changes in the attribute value column.
- To modify values for just a few of the selected features in a layer, click each feature you want to update so it is highlighted in the Attributes window, and make the edits.
- To edit the attributes of feature or records that are related to the selected features, click and traverse through the tree, and edit the values.
- To modify the attributes of multiple related features or records, click each related item you want to update so it is highlighted it in the Attributes window, and make the edits.
Editing attributes in the table window
You can also edit attributes in the table window. An attribute table window can show you the values for all features in a layer. Editing attributes through the table window also allows you to quickly make changes to several features (records) at once using the field calculator.