You can't add data fields to forms where they don't belong

Only those fields that are available for each form can be used on it. You cannot create new data fields for any form. You also cannot copy data fields from one form to another unless the fields that you want to copy are available on both forms.

Similarly, you cannot add a data field to pages or copies of a form unless that field is available on that page. For example, you can't add a "Deduction Amount" field to the first stub of a paycheck, because this field is only available on the second stub. You can, however, add a "Payroll Categories" field to any stub, since this field is available on every page of the form.