Limit Submission depend on multiple textfield

I plan a weekend with a group, but the camp house is limited with 70 persons. I read the possibility for limit submissions in a form, https://www.jotform.com/help/137-How-to-Limit-Submissions-in-a-Form. In my form I have a multiple textfield where the person can sign in also for his wife or the kids. Normaly one submission move away one position from the limit submission. How it is possible to count the rows and move away from the limit Submissions?

You can try our Quantity Gift Registry widget. With this widget, you can specify the maximum number of seats allowed to book. Here is the demo form: https://form.jotform.com/82675008180961

You can also use the appointment slot widget. Here also you can specify the number of total seats and limit them to a maximum number. Demo Form: http://www.jotform.com/form/43352010062942

Feel free to clone and test the demo forms.

This is the usual approach to limit the number of seats. Let us know if this doesn't suit your requirement.

Thanks AshtonP, I know already Quantity Gift Registry or appointment slot widget. I just wonder if it is possible to creat something decent on the submission limited.

Unfortunately, there is no way to use to disable the form based on the number of persons or calculation based on any other field. You will need to use one of those widgets to limit the bookings.