By design (of every application in the world) Radio Buttons are a single select option. You must use a Checkbox to select multiple options for one field.

With that in mind, you may need to change your approach before we can offer assistance or a solution for your invoices. Please let us know if ‘multi-select’ checkboxes are what is required.

We remain at your service.

Okay, checkboxes should be used for any fields which allow more than one option to be selected.

Can you attach the PDF invoice to this login support form so that we can see how the invoice data is to be presented? Additionally, we are happy to login to your site to map a Formidable checkbox field to your PDF invoice form as an example.

We remain at your service.