If I do that I lose the validation features of cForms.

Correct. That's why it's not considered a feature or 'recommended' solution, merely a workaround if you indeed require multi page forms.

I usually suggest to use jQuery (javascript) to control a larger form on the same page, which requires good Javascript skills.

Is there a way to store one field value and pass it along to a redirected page without activating Alternative Action? I want to keep the validation features of cForms.

no. since the redirect happens after the submission, all $_POST / $_GET would be lost.

What could possibly be done, is to use a PHP session to store all data until the user also submits the last form, here is a possible outline of a solution:

1. use my-functions.php to store all submitted form data in the PHP SESSION
2. after success submission, redirect to next form page (triggering #1 again)
3. the last form is a dynamic form:
   1. helps you to access the PHP Session using your own PHP
   2. and building the necessary form field array
   3. -> you need to create a hidden field for all PHP Session stored data and feed it what's been recorded
   4. then add your final, visible form fields to the array and have the user submit that last form with all other (hidden) values

possible issue I can think off:

• every form will generate an email, so you may need to use a black hole email address or use this email/info as an adication as to where users may have dropped out the process.
• you need to manage the PHP session and invalidate/reset it if required