Do you have an example form?

Do you have an example form

1.submit form with hidden fields...

2. Submit redirects to my URL with

    Responses+hidden field

   Thanks.......Bob

Hi Bob,

Here's a sample form I just created for you as an example https://form.jotform.com/70435404599966

This form has 3 fields, one field is hidden with label Hidden Field. When you submit this form, it would redirect back to the form (as an example) and populate the email and hidden box fields. 

To add a hidden field, just search hidden box field in the widgets tab and add it in your form.

You can also add a regular textbox field and hide it by going to the field properties > advanced > hide field.

And to add your custom thank you URL, here's how:

If you want to capture the form data after submission and post it on your website or your custom URL, you need to use post method to achieve this. This requires basic knowledge with PHP. Guide: https://www.jotform.com/help/213-Send-Submission-Data-via-Post-Method-and-Thank-You-Settings

If you need further assistance or if this is not what you mean, let us know so we can further help you.