I am selling items separately but would like to be able to offer flat rate postage on extra items, but only up to a certain number (say up to four items when they fit really well into a prepaid box or satchel).
I know you can select 'free' for additional items, but there doesn't seem to be a way to set a limit on the number of free additional items added to a flat rate box.
At the moment I am having to send people an invoice or refund extra postage they've paid if they want to bundle more than one item into a box.
Is there a way to do this? Any advice is most appreciated.
