I would like to know how we can apply a custom field to be on the list of invoices. We would like this custom field to be visible so we can identify what the invoice is for.

We currently have PO# listed but we dont actually use it. and its currently quite difficult for us to identify what an invoice is for.

We have created a custom field called "Job Reference"but in no way can we find out how to apply it to the list

please advise if this is possible

thanks in advance