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Unfortunately, we do not have such a feature. Can you provide us more details about why you need this kind of feature and what you want to achieve with it? You can add page break to your form and then add conditions to skip a pages. You can find out how to create multiple pages and how to use conditional logic inside of this articles:
Looking forward to your reply.
Why I would like it - I have a long form that has a middle section that many users will not be interested in.
Where I live, our internet is frustratingly slow, so I don't what to make this form multi-page because of the slow speed of reload.
Submit button needs to be at the bottom so that those needing to do the middle section don't submit too early.
If you are making a long form with multiple fields on it, we advise that you create it as a multi-page, why? Because if you are making the form very long and only one page it will cause the browser to load more slowly, this is because the browser loads everything on one page. Unlike if you create a multipage form, it loads the content of the form per page, making it more easier for the browser to load the contents.
You could also use our collapse bars to divide the forms into sections, you can find a guide here: http://www.jotform.com/help/297-Show-or-Hide-multiple-fields-at-once-using-form-collapse-tool.
I hope that helps.