This document provides instructions for installing and configuring an add-on for Tally that prevents the creation of new sales bills for customers if they have a certain number of unpaid bills or have exceeded their credit limit. It describes how to copy the customize file to the Tally folder, activate the custom solution, and set the number of unpaid bills or credit limit threshold that will prevent new bill creation for a customer. The add-on allows restricting new sales bills based on payment history and credit limits to manage accounts receivable.