1. Check existing lines Use the filters in the document to identify lines with the incorrect rate. You can then modify them individually or apply the new rate globally via the header. 2. Automatic recalculation of amounts Once the rate is corrected, Sage automatically recalculates the amounts excluding VAT, and including VAT. This ensures consistent totals without manual intervention. 3. Training to save time To master these steps, you can follow tutorials such as YouTube videos that explain how to create and configure rates in Sage 100 Accounting.