You can record the purchases with additional ledger.
To record purchases with discount
1. Go to Gateway of Tally > Accounting Vouchers > F9: Purchase.
2. Enter Supplier Invoice No. and Date in the purchase invoice.
3. Select the party ledger in Party's A/c Name option.
4. Enter Party Details, as required.
5. Select Purchase Ledger from the List of Ledger Accounts.
6. Select the Name of Item from the List of Stock Items.
7. Enter the Quantity and Rate. Amount appears automatically.
8. Enter the percentage or amount of discount.
9. Select the discount ledger, and enter the amount.
10. Select the VAT ledger from the List of Ledgers.
11. Set the option Provide VAT Details? to Yes or No, as required. The purchase invoice appears as shown below:
12. Press Enter to accept the purchase transaction.