how do i add a field to the invoice item list

Hello Friends,

Please how do I resolve this issue:

In Change (VF22) or Display (VF23) Invoice List, I want the Invoice List Number to be among the fields printed out on each line item of the Invoice item list, so I tried to see if I can add Invoice List Number field as one of the fields in the Invoice item list but its not among the variant setting.

My question is, how can I resolve the issue so I can have the Invoice List Number printed on each line item of the Invoice Item List in the output?

Please I need your advice.

Best regards,