How many ethnicities do you have?
The tool isn't able to add new entries to an existing domain. It's primary purpose is to allow you to quickly create topics and articles from CSV/excel data.
Normally, a user would add additional entries manually to a domain before producing a structure export to be used for the topics that they will be importing.
If you are familiar with XML, then you could update your structure only file to include the additional tags. The minimum for each tag would be.
Quote:
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<tag tag_id="Tag_XXX" name="new name">
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Where Tag_XXX is unique across the entire file (start from the highest number + 1 already in the file and work upwards).
(Note that you should not include the original_uuid or signature attributes for your new tags.)
I don't know if you can import just a structure only file into an existing realm.