Complex invoice/purchase orders.

I need to create an invoice that allows a product that is zero rated VAT to be invoiced. Associated with that product is a levy and the levy has VAT applied.

I also need to produce purchase orders that take a zero rated VAT product as a starting point (priced on weight) and subtract the same levy and associated levy VAT from the cost to arrive at the total.

I am new to FrontAccounting and wondered if there is an easy way of doing this?

Many thanks