Can the Pre-Order Manager split the order for pre-order and non pre-order items?

No, the Pre-Order Manager is unable to split the orders between pre-order and non pre-order items.

No, the Pre-Order Manager is unable to split the orders between pre-order and non pre-order items. If pre-order item(s) is/are checkout together if non pre-order item(s), it will be considered as the same order.