This document provides an estimated amount of change required in sales rate to accommodate the effect of GST to be charged to retailers. It does not provide accurate calculation, and you must use a company price list for correct prices. You can import company price list using the System->GST Updates menu. If you reduce prices using GST Updates Menu->Change rates option, you can do the same for each tax code, but it is to be done with extreme caution. It is an irreversible option, and you cannot repeat it again. If you run it again, it will decrease your prices and create a loss for you. You are responsible for all the changes done using this option. We cannot support you for the same.