drewdizzle 0 Newbie Poster

I have created an interactive form in Acrobat 9 pro. I have used the date function in order for the date to appear when the form is opened but I need to be able to make the tax add to the subtotal and appear in the total box. But I am not sure how to reference the total text box. If some one could point to the direction as to where I could find this information; it would be greatly appreciated. Attached is the form.
Thanks

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