Thank you Smino,
I would like to explain my doubt more clearly.
Like in the second image I have highlighted blue box which is the naming format for the Doctype Item Tax Template, that name is fetched in the print format Tax Rate Column.
But If you see the Item Tax Template form in image 2 the title field has to be fetched in that Tax rate column.
I need to achieve this using code .
I achieved using custom field but the requirement is we should not use custom field we have to achieve through script or using changes in field properties if possible.