In the Edit Order Invoice template in my store, there’s the following code already in place:
{%- if po_number %}
PO number #{{ po_number }}
{%- endif %}
Where does one find the field PO Number when entering an order? I have some customers who will sending in orders via PO. I would like to enter their PO number into their order when I Create Order. Otherwise, I would like just make an order Metafield called PO_Number and display it on their order.