If user wants to show bill discount also in voucher details so then user have use calculation 8 in bill,follow the below steps to change calculation type:-

1. Change calculation in Selected bill

Go to Transaction > Sale > Modify > Modify window will be appear > Feed date or select All date & then press enter key > All selected date sale entries will be appear > Press enter on selected entry > Click on Modify > Press page up key at the end of the item > Change details window will be appear > Change calculation as "8" & press enter key > Then press ctrl+w for save > Press "F8" key on selected bill > Voucher details will be appear with the discount.

2. Set calculation for the all bills

Go to Master > MargSetup > Control Room > Click on Calculation > Click on Accept > There is one option shown > " Local Sale -> Gst Invoice" &  Local Sale -> Retail Invoice ---Change calculation as "8" > Then press esc key and save.