How to populate form fields from other fields on the same form

How is the function applied to auto fill fields similar in nature, i.e. address fields for shipping, billing when they are the same as a "primary" address already populated? 

We can do this with conditional logic on forms, please follow the next guide to find out more information on this:

How to Populate Field with a Value from another Field?

Please feel free to contact us if you need any further assistance.

Hi there – I am never able to get to the solutions linked in your responses. I get an error message like “page not found” – this seems to happen whenever I try to access info linked in response to the forum. Suggestions on how I can get past this?
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Hello,

We apologize for this inconvenience.
Please try to copy/paste the following texts in your browser:

Conditional Logic: http://www.jotform.com/help/57-Smart-Forms-Using-Conditional-Logic
Populate Field: http://www.jotform.com/help/286-How-to-Populate-Field-with-a-Value-from-another-Field

Please let us know if you were able to see the guides.
Thanks.