How Do I Only Charge GST on a Food Order?

Start by adding the food item as a new product review Adding Products to Commerce7 here. 

For this example add the product as General Merchandise.

Under the Tax Type drop-down, select Food.

 

Check that your GST tax rate is correct and that the PST tax rate for food is set to 0.

Review Setting Up Tax Rates here.

Test an order to ensure the food product is only charging GST.