I want to apply global tax.Means not in product order line.

globally tax apply on total of product order line.

Example:

I have one sales order SO001

In order line 5 Product line is available which price different.

I have to add tax for every product line.

Now I want to apply global tax on untaxedamount Not in Order line.

Then Final Figure Should come with untaxed amount + taxed = Total amount