I’m pleased to say that this has now been implemented. There is a slight caveat though… currently this feature is only available for those accounts linked to an Affinity dashboard. We will also be making this feature available for those who are subscribed to our advanced toolset (scheduled to go live late November/December).
http://help.quickfile.co.uk/main/1/the_multi-invoice_entry_form.htm#3
Anyone looking to trial Affinity will receive a free £10 credit, you can sign-up here. Once the account is created you can link any existing stand-alone QF accounts.