How do I get my document to have multiple columns

I think this is possible by following this guide: http://www.jotform.com/help/90-Form-Field-Positioning. 

There you will find the steps to display two or more fields inline achieving what you want; however, if you want to apply an specific layout to your form, then provide us the details, this will need to inject some custom CSS codes and we will be glad to assist with that.