If user does not want to write a MapBasic application then open the MapBasic Window, (aka: MB window) , open the table and map it, go through creating a theme manually, then export it via Save Window As, and the MapBasic statements will be echoed into this MB window. Do a close all.
Then execute each line echoed in the window to open this same table, change the field used for this theme, and filename being exported, and close all, etc., and keep executing the same lines in MB window repeatedly for each column and export file like a script. Can also save these echoed commands as a text file to use another time in the MB window.