Check Boxes

Just assign a value to the 'Export Value on the"Options" tab for the field's Properties. Any calculations you preform may need to be coded to handle the non-selected state which has a value of "0ff" if you use the "Custom calculation script".

Thanks that worked but I'm having another problem. I am using the product(x) calculation option. I have 2 check boxes and only one can be checked at a time. I need it to multiply by only the selected check box. I can get it to work by having just one check box in the calculation but not with both.

Don't use check-boxes, then. What you describe should be implemented with radio-buttons.

You can make check boxes work similar to radio buttons by giving them the same name and different export values. Otherwise you would have to add some script to each button to make sure only one button is checked. Use of radio buttons would not allow for the de-selection of both buttons once one has been selected.