Customer don't want to generate WHT Invoice separately for each invoice and Business would like to g

Summary

Customer don't want to generate WHT Invoice separately for each invoice and Business would like to generate single WHT Invoice

Content

Customer don't want to generate WHT Invoice separately for each invoice. They would like to generate single WHT Invoice for all invoice in a month. Is it possible generate Single Invoice ? or do we have any report to show the WHT balance for creating single Invoice?