Manages the attribute definitions for blocks in the current drawing.

You can edit the attribute definitions in blocks, remove attributes from blocks, and change the order in which you are prompted for attribute values when inserting a block.
Attributes of the selected block are displayed in the attribute list. By default, Tag, Prompt, Default, Mode, and Annotative attribute properties are displayed in the attribute list. For each selected block, a description below the attribute list identifies the number of its instances in the current drawing and in the current layout.
You can specify which attribute properties you want displayed in the list by choosing Settings.
Double-click an attribute to display the Edit Attribute dialog box, where you can modify attribute properties.
The following options are displayed.
You can use your pointing device to select a block from the drawing area. When you choose Select Block, the dialog box closes until you select a block from the drawing or you cancel by pressing ESC.
If you modify attributes of a block and then select a new block before you save the attribute changes you made, you are prompted to save the changes before selecting another block.
Removes the selected attribute from the block definition. If Apply Changes to Existing References is selected in the Settings dialog box before you choose Remove, the attribute is removed from all instances of the block in the current drawing. The Remove button is not available for blocks with only one attribute.