We don't have GST for all the items in invoice? We create Invoice outside QB and attach the invoice in QB. How to enter the GST, As it is not flat GST for all the items.

You'll have to turn on the GST feature in QuickBooks Online, Thulasiexim.

This way, you can assign a GST code for each item. I'll walk you how:

1. Click GST.
2. Choose Set up GST.
3. Fill in the blank fields.
4. Click Set up.

You can refer to my screenshot below.

If you have more questions, you can leave a comment below.