For Spotfire 7.14 and below: Open TIBCO Spotfire Analyst >> Edit Menu >> Data Table Properties >> Select the Radio button - "Create automatically for all columns". Click on the "OK" button. Now create a new calculated column and its corresponding filter will appear in the filter panel.
For Spotfire 10.0 and above: Open TIBCO Spotfire Analyst >> Data Menu >> Data Table Properties >> Select the Radio button - "Create automatically for all columns". Click on the "OK" button. Now create a new calculated column and its corresponding filter will appear in the filter panel. Below is the reference image:
Note: For previously created/added columns, click on View Menu >> Data. The filter icon will appear on hover-over the column.