Yes you can, it is well explained here and has a powerful configuration, as you can even define other analyse kinds like Postcode, Phone, Web. Filtering records is also possible.
Including fields in the fuzzy algorithm matching
Define which fields will be taken into account by the fuzzy algorithm, and which field matching template should be used for each field. If several fields use the same field matching template, they will all be compared to each other. For example, all phone and fax fields use the Phone template, hence all phone and fax numbers will be compared to each other.
If there are fields available that upon finding an exact duplicate should result into a 100% double, use the key fields configuration.
To my understanding, it is limited to fields on the main table.
Since Efficy 11.2, settings are no longer stored in an ini file next to the service, but straight into
SYS_SETTINGS with name