Sales taxes should really be set up or modified with the advice of your Adagio Reseller. There are many factors that contribute to how taxes are calculated, including the tax statuses of the customer and item - not just the tax groups and jurisdictions.

If you are going to attempt this on your own, then you should carefully review all the discussion of sales taxes in the Adagio Receivables, Inventory and OrderEntry manuals, and, on a copy of your database make individual adjustments and process sales that will test the changes you are thinking of making. The tax calculations should be audited all the way through to the general ledger and tax tracking reports (if you use them).