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Add a Summary Screen

Now let's total the order. To do this, we'll add a screen and call it "Order Summary". The first field well want is a subtotal for the order. Canvas has a summary field that makes this really easy.

Summary fields can sum all the integer, decimal or calculated fields in a list of items. It's similar to the SUM function you use in Excel. First select the screen, then select the field that you want to sum up.

Now let's calculate tax. Let's add a field that lists the tax rate for the state in which we normally do business. Our users can change the tax rate if they want.

The amount of the tax is a calculation, and so is the total.