One of my favorite little enhancements in AutoCAD 2008 is the ability to create block attributes with multiple lines of text. The Attribute Definition and Edit Attribute dialog boxes include a new Multiple Lines control. When you select Multiple Lines, the Default text box is disabled and you’re provided with access the Multiline Attribute editor.
The Multiline Attribute editor is a simplified version of the MTEXT editor enabling you to enter text, adjust the width for text wrapping, insert fields, underline, and overline. You can use the right-click menu to access additional MTEXT editing options such as Import Text, Background color, and Autocaps. When you define a muiltiline attribute, an additional control in the Attribute Definition dialog box as well as in the Enhanced Attribute Editor, enables you to specify a Boundary Width.