Hi John,
It is better to use an OrderLine entity, so per order you get an object which relates the Order and the Item and can keep track of things like how many items (for that item on that order), the current price, when it was added, by who, notes for that specific order/item combo.
[Order] <---1-n---[OrderLine] ---n-1---> [Item]
With kind regards,
Stephan