Step 1 : Go to Setting Page
Step 2 : Find a Table section with Title “Invoice Option” & Click on “Edit” button on it.
Step 3 : On Inovice Option page you will find a Options for Discount
1 – Check Enable Discount checkbox if you want to show Discount Field in invoice
2 – Select Option for Rs. / % for Discount
3 – Applicable if Discount is in Rs.
Step 4 : After making changes Click On Save Button at end of page
Step 5 : You can see Message on Next page For Details Updated.