1. Navigate to the order in question

2. Locate the "Order Information" box at the top of the screen

3. Click the "action menu" in the top right of the box

4. A pop-up will appear with many options to change

5. Locate the "Price Grid" option

6. Once you click the "Price Grid" drop-down, you'll have the option of selecting from any of the existing price grids in the system