Replace a column in open tickets

We have a customer status called invoice so we know these tickets require us to bill the customer. The ticket stays open until bill but from the screen we can't tell what is open and what needs invoicing.

I would like to remove the Assigned to Column as we only have 1 department and replace this with Status to we can see the tickets with the invoice status clearly. I have checked out the forum and see a customisation for this based on V1.10

Any help her would be great

Thanks

Glenn