从远程/模态引导表单中添加元素并使用父页面表单提交它们

I need have a parent bootstrap page with a form. Within this page I have a bootstrap dynamic modal that loads in an external page that includes some form elements and also a submit button that submits the parent page's form. When I click that submit button, I need the form elements on the child/ajax/included page to be included along with the form elements on the parent page. Currently, the form DOES get submitted, but the form elements are not being included.I need have a parent bootstrap page with a form