There isn't one, in company settings, customize forms you will need to use a custom field for that
You can add a box where you can enter the Customer purchase order number. Here’s how:
I’ve attached some screenshots below for further illustration.
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I don't have a plus option at the top of my invoice. I can't seem to add a purchase order number anywhere. Help please
You can create a custom field to add your customer's purchase order number, louiselarkum.
If you want to add the field just for a certain customer, please follow the steps shared above. However, if this is for all your customers, then here's how to do it:
I'm adding these screenshots as you visual guide:
On the other hand, you can run a Purchase Order report if you want to view all the purchases. You can either select Open Purchase Order List or Open Purchase Order Detail.
You can also use the steps above if you want to add a different custom field.
There you have it. I'm sure you can now able to add a purchase order number.