And As @sharpdrivetek told, There is only one GST which is divided between the state and centre. So it appears to you as GST on GST. If GST is 12%, during intra-state sale, state takes 6% center takes 6% and in case of inter-state sale the whole 12% goes to the centre. We just have to show this separately on the invoice. So Manager Team will only can help on this type of template making, which can solve this Issue. And as i told earlier, we can reduce the 15 Columns into only 10 columns ..... As the Picture bellow.