Does AutoMapper's AllowAdditiveTypeMapCreation not combine mappings?

edit

No, AutoMapper's AllowAdditiveTypeMapCreation does not combine the mappings. It allows the creation of new mappings for the same types without throwing an exception. When a new mapping is added, it will overwrite the existing mapping for the same source-destination type pair. If you want to combine mappings, you can use the CreateMapOverlappingTypes method. This method combines existing and new mappings for the same source-destination type pair.