You add an attribute to a drawing by first defining it and then saving it as part of a block definition. To define an attribute, you specify the characteristics of the attribute, including its name, prompt, and default value; the location and text formatting; and optional modes (hidden, fixed, validate, predefined, and locked).
To define an attribute Advanced experience level
Do one of the following to choose Define Attributes:
In the Define Attribute dialog box, type the name, prompt, and default value.
Under Insert Coordinates, specify the location of the attribute, or click Select to select a point in the drawing.
Under Attribute Flags, select the optional attribute modes.
Under Text, specify the text characteristics.
To add the attribute to the drawing, do one of the following: