The projectname.wdt or default.wdt mapes the titleblock attributes to lines in the dialog box. Map all attributes you want to edit into this file.
For example:
TITLE = LINE1
DESC1 = LINE2
DESC2 = LINE3
DESC3 = LINE4
DWGNUMBER= LINE5
DATE = LINE6
We have 67 attributes on our title block that is mapped this way and it allows us to edit them using the "Project Descriptions" dialog box.