Transaction text based on main and sub in FPL9 chronology tab

Dear Expert,

In a new development, user requirement is to enhance the text of transaction in FPL9 chronology tab. Is there any way around availabe through which transaction text can be display in FPL9 chronology tab. In standard behaviour, it display the text on the basis of origin. If this can be enhace and transaction text can be displayed on the basis of Main and sub transaction.

Please suggest any configuration available or event which can help to achieve this requirement.

Regards

Arun