The way that PowerStore is setup you will not record the charges that are created under that tab. Only the tax and shipping will be recorded for the order. If you would like to record your charges for the order you will need to start by adding in a column to your orders table to hold the charges. Once you have done this you would need to update the store order summary on both of the confirm pages. In these server behaviors you would need to bind the total charges to this new charges column.
Once you are recording the value in the db you will need to update the admin order details page by adding in your reference to the newly crafted column in your orders table. If you name your new column OrderCharges then you can use the reference that you have here for that.