I'm trying to post an invoice which is split between a vatable and non vatable amount so wondering if there's a way on Sage Instant to post these into two separated lines and show the amount the Vat refers to. I was used to Sage 200 thus I'm finding the "Batch invoice" posting quite restricting when it comes to post multiple lines invoices.
Assuming you mean a purchase invoice from a supplier, you can set fill in one line as the vatable amount, the next line can be your non vatable and as long as you keep the same reference it will group them together as a single invoice.
