Can I deduct a discount from my customer invoice?

Hi @aveek.ghosh.1,

Yes, you can add a Discount field for your customer's invoices in QuickBooks Online (QBO).

Follow these steps:

1. Go to the Gear icon.
2. Select Account and settings.
3. Click the Sales tab.
4. Tap the Sales form content section.
5. Enable the Discount feature.
6. Hit Save, then Done.

I suggest you also take a look at this article: Record commonly-used transactions. It includes the steps on how you can set up a recurring transaction in QBO. 

Feel free to post a comment below if you have other questions about the Discount feature in QBO. I'll be around to assist you in case you need it.