You want to know what impact does adding the ship to/bill to for customers under the "Customer Bill/Ship Information"?
- BillTo/ShipTo is typically used for large accounts. The larger accounts will typically setup their Headquarters as the BillTo and the local stores in a state as a ShipTo.
- This way they can send one request to HQ, get a certificate from them for all their stores in a given jurisdiction. When a certificate is applied to the BillTo level, it will also flow down and cover all the ShipTo locations.