Is there a way to set up a tax rule that is based on the net total amount of a sales order?
e.g. set up a tax rule that will apply when the net amount of a sales orders exceeds 80
I don’t think there is any configuration available in the system right now that will handle your use case.
You may have to write custom scripts to handle this
Refer this link https://erpnext.com/docs/user/manual/en/customize-erpnext/custom-scripts