Add to TM by overwriting the existing TU (default): Overwrite the existing translation unit
Add to TM; overwrite the existing TU if attributes are identical: Overwrite the existing translation unit if the attributes match
Only add to TM the new TU; do not overwrite the existing TU: No overwrite, just add new TUs to the existing translation unit
Add to TM; do not overwrite the existing TU: No overwrite, just add TUs to the existing translation unit
Do not add to TM: No addition to be made to the existing translation unit