The correct tag for the correct total is not always there in Orderhive - if you need net subtotal without VAT or with, taxes calculated before discounts or after. There are so many variations, with a global economy with multiple legal requirements, it would be almost impossible to include/create, them all.
This would be fixable with the ability to do calculations or formulas in templates.
For example, if you needed net unit price, you could have [Rate]
minus
[Tax].
If you needed a subtotal without tax, you could have [Order Grand Total]
minus
[Tax], etc.
It would make templates incredibly powerful, and mean that you could create a template for almost any set of accounting requirements for any country in the world. Regardless of where your business is based or what your accountant says you need on your invoice, Orderhive could do it, OOTB.