There is no field test that would be practical for the scenario you describe. Your source data need to have either just one ethnicity choice in the Ethnicity field or multiple ethnicity fields (one for each possibility), each of which can be populated with, say, Y or N. The only workaround would be to output «EthnicityRace» as a string then use a macro that finds those outputs in the resulting merged documents and updates the existing checkboxes.

As for the example you gave, it could be expressed as:
{IF«EthnicityRace»= "American*" {SYMBOL 254 \f Wingdings \u } {SYMBOL 253 \f Wingdings \u }}
There is no need to write the choices out in full or for the \* MERGEFORMAT switch.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]