Customized tab.
Select input file ... from the File menu or the icon Files of Type list.
OK button to have a header choose window. This window shows you the beginning of the first input file (if you select a set of files) as a table format.
OK button to close the window. You will see the selected headers are showed in the Input Header
IA and IB are required. Only they are defined, is the icon Ann tab to define the columns for ann file.
Start converting from the File menu or the icon