1. Create a segment.
2. Enter the segment’s name.  (Lowercase characters and underscores only.  No spaces.)
3. Enter the segment’s description.
4. Within the query field, use the following query string syntax.  (ListManager will add the other required SQL clauses in the background).
5. members_.DemographicColumnName in (value1, 'value2', 'value3', 'value4', 'valueN')
6. You can build your query string in a text editor and paste the string into the segment query window.
7. Enclose all non-numeric values inside single quotes.
8. Save and test your segment.