How to remove ‘discount tax’ from invoice

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Subtotal ₹4,000.00
Discount – ₹91.53
Discount Tax – ₹16.47
Shipping ₹0.00
Shipping Tax ₹0.00
Fee ₹0.00
Total ₹3,892.00
Here I want to display discount as ‘INR 108’ instead of separating them as Discount and Discount tax.