Hi Jim,
The file for the custom column added to the Locator Search results is located in the $SPECROOT/custom/topo/config directory. Depending on how the customization was done the file will either be the "table-searchresults-config.xml" or the "table-model-config.xml" file.
To ensure all the OneClick servers have the same customizations, I would simply copy over the entire $SPECROOT/custom directory, from the "primary" OneClick server, to your other OneClick servers, and bounce tomcat.
If you need to synchronize the MIB Tools database between the various OneClick servers, see the "Certifications" guide - "MIB Tools Support for Multiple SpectroSERVERs" section, as well as the "Import and Export MIBs" section of the guide.
Thank you,
Brad