1) the column "prezzo unit." shows the price for each item, excluding VAT (for all).
2) in the column "sconti", when allowed (discount), it is visible its percentage.
3) in the column "importo" the pdf shows either the total including VAT (for EEC privates) or the total excluding VAT (EEC companies and rest of the world), deducted the discount. In the pic below the total has been calculated this way:
€5,06 x 2 = € 10,12 - 5% discount = €9,61 + 20% di IVA = €11,53 (the pic shows a proforma for a private EEC customer). Slight differences in more or less in the total due to the decimals.
4) the "totale importo" is the total of the order, the one to transfer by bank transfer or paypal in case you accept the proforma.
5) the "spese postali" (shipping charges), can be either VAT excluded (if registered airmail tarif, for all customers) or VAT included (for shipments by couriers, exept EEC companies and the rest of the world)
6) here you can see your billing address.
7) here you can see the shipping address, if different. Please always be sure that both are correct (the third line of the "shipping address" is hidden here but visible, if written during the registration, on the invoices and stickers for the packaging).