CRM and Finance Tab - Add Invoice "Subject " Column

CRM and Finance Tab - Add Invoice "Subject " Column

When On a contact in CRM, and you click the Zoho Finace tab, how can I put in the invoice subject line? Or even a custom field for this.  We need to see what that invoice is for, without opening it.   If we have tons of invoices we need a way to quick glance to see what invoice is what.

If we cant do this  - Can this be done with a deluge scripting?