By adding multiple records to the same object, you can keep track of historical information related to the object.
To attach multiple records to an object
Record # changes from 1 of 1 to 2 of 2 as AutoCAD Map 3D toolset advances to the newly created record.
Select the field in the object data field list. Enter the new value in the Value box. Press Enter. Repeat this process for each field in the record.