It is currently not possible to import a list (from TXT or CSV) of objects to be monitored.
The objects must be picked from inside of the Client via the object picker.
Enhancement Request VSTS006886 has been created for consideration in a future release of Change Auditor.
The following ER has also been logged:
Item 152666: As CA Operator, I want to be able to import a list of object names to search/alert on