Follow the below steps to print difference between MRP and Rate-A on bill printing:-

1. Go to Master > MargSetup > Self Format > Feed date as password in reverse format(yy/mm/dd) > Select Format type Select format > Page setting > Click on Next > Search---"My Veriable" > Then click on Accept > In next window put the command(SB_MRP-SB_RATEA) of MRP and Rate difference in My VAR01 heading > Then press Esc key for Save.

2. Thereafter, the format window will appear > Click on Bill format > Grand Total > Press "F1" function key > Search---"My Veriavable" > Then press enter on Total my veriable 01 > Then press "F3" for apply command(MY_VAR01,14,2) > Then press Ctrl+W and click on Save.