How can I Add GST to each product in Microsoft access?

[Jojoneedshelp]

How can I add gst to each product in access, right now I get a subtotal for each building and then it adds gst at the very end, I would like to add gst to each of my products, anyone know if this is possible?

[Rabbit]

What is gst?

[zmbd]

He's either refering to a "goods" tax that Canadians get hit with or he's refering to a grand sub total.