In Purchase order , we are unable to add discount value which vendor has given to us . Any suggestions are welcome.

I’ve got some information to share with you about adding discounts to purchase orders, @Rethin.

At this moment, adding a discount to a vendor transaction isn't possible in QuickBooks Online. You can set up a discount item as a workaround to add the discount value to your purchase order.

Here’s how:

1. On your Purchase Order page, select the item.
2. Enter the amount.
3. In the next line item, select the dropdown.
4. Press Add new.
5. Select Non-inventory or Service type, then fill in the fields.
6. You can enter "Discount" in the Name field.
7. Click on Save and close.
8. If you’ve entered a specific value on the setup page, it’ll automatically reflect on your Transaction page. Otherwise, you’ll need to enter the exact discount value on the Amount field as negative.
9. Once done, press Save or Save and close.
   

You can also go to your Products and Services then click New to add the item.

In addition, here's a guide in case you need instructions in adding a discount to your sales forms: Add a discount to an invoice or cash memo in QuickBooks Online.

If you have any other questions or concerns besides adding discounts, just let me know. I’ll be here to help. Always take care!