I'm creating a form in adobe acrobat. It is to purchase studies. I have a field for the subtotal of the order and I have a field for tax however the tax is only applied to NJ residents so I would want a checkbox next to the textbox that activates the text box. i.e. if the person lives in NJ, they check off the box and the textbox automatically calculates the 6% sales tax but if the checkbox is not checked I would want the textbox to be unactive. Do you know if this is possible and how I can work it? I've searched all over the internet and can't find any answers. Thanks in advance!