Thank you for reaching out to the Community. The Government of New Delhi has made it mandatory to mention 8-digit HSN or tariff code while issuing Goods and Services Tax (GST) invoice.
You may want to check this link to learn more about the HSN and SAC Codes in GST.
Since 3 months I have been following up with your team to update 8 digit HSN Number which is mandatory in India starting from 1st April 2021, How to make this possible from your Development Team. Currently, we can update only 4 digits.
Thanks for reaching out to the Community, @8 digit HSN Number.
I can help you get the support you need about the HSN codes in QuickBooks.
Ideally, you should be able to enter 6 and 8 digits HSN codes into your products and services. If you've already followed the browser troubleshooting provided above, I suggest you proceed with contacting our QuickBooks Support Team.
Here's how:
Click the Help tab at the top menu bar.
Select Contact Us.
Enter your concern, then hit Let's talk.
Choose to Start a Chat.
Let me also share these articles with you for more reference about adding HSN codes in QBO: