company gst missing in quick subscription invoice

Hello, Nag. 

Thank you for posting here in the Community. I'm here to ensure that you'll be able to save your GST number in QuickBooks. Here's how to do it: 

1. In the left navigation bar, click Taxes.
2. Select GST from the Tax dropdown.
3. Click Edit GST and then Edit settings.
4. Enter your GSTIN.
5. Tap Save. 

I recommend visiting the following article to learn how to handle GST in QuickBooks: Setting up QuickBooks for GST. 

If the issue persists, I suggest reaching out to our customer support team. One of your representatives will be able to pull up your account and rectify the issue. Customer Care Team. 

Let me know if there's anything else that you need help with. Take care!