What is the ruling on helping colleagues achieve targets by recording invoices in their names, whether for financial gain or not, and what is the ruling on benefiting from this to avoid dismissal?

The first is for each employee to be independent in his work without relying on others. There is no harm in one of them conceding some customers to his colleague, as long as no injustice, falsehood, or contract violation occurs. There is no harm in taking money in exchange for waiving some of one's right.