You can add, modify, and delete fields in newly defined object data tables until you perform a save operation. If you have Superuser privileges, you can rename or delete object data tables.
To modify an object data table
AutoCAD Map 3D toolset updates the object data field and all instances of it attached to objects. If you change the data type of a field from Real to Integer, AutoCAD Map 3D toolset drops everything to the right of the decimal point, leaving only the value to the left of the decimal point.
To rename or remove an object data table
To delete the table, click Delete. The table and its object data fields and field values are deleted from every object to which they are attached.
When you delete an object data table from a drawing, the table is deleted from all attached, active source drawings.