Using a Checkbox to fill in a field

[RHathaway]

I am looking to have a checkbox fill in a sales tax field.  I would like the checkbox normally checked and fill in with the appropiate sales tax calculation (I am using TaxableTotal*.012).  Than if the user unchecks the checkbox the field will go to zero.  I am just not sure how to make this happen.

Thanks in advance

[try67 · Accepted solution]

Set the export value of the check-box field to 0.012 and then just multiply the two fields directly.

When the check-box is un-ticked the result will be 0.

[RHathaway]

Thats what I was lookign for.  Thank you!