To display this dialog, open the data source node options dialog, choose the select manually categorical fields option, then click on the select button.
If you are loading data from a CSV text file and have not flagged categorical (text) field headings with an asterisk, this dialog enables you separate the fields into 2 types: numeric and categorical (text).

Numeric
This window lists all the field headings that are available in the CSV text file that you have loaded into WITNESS Miner.
>
Highlight a field in the numeric window, then click on the > button to transfer that field heading from the numeric window to the categorical window.
>>
Click on this button to transfer all the field headings from the numeric window to the categorical window.
<
Highlight a field in the categorical window and click on the < button to transfer that field from the categorical window to the numeric window.
<<
Click on this button to transfer all the field headings from the categorical window to the numeric window.