Hi Freddy,
As per my understanding, i do not think this will be possible in standard SAP system. As everytime the PO quantity will be different, then how the system will divide the quantity into two or multiple inbound deliveries.
you can create multiple schedule lines in the delivery schedule tab at item details during the creation of PO. then you may go for abap customization to write a logic to create a separate inbound delivery for each schedule line.
Regards,