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I get that you are asking about how to add blank columns and rows to your jotform but I'm not sure that I fully understand what it is that you are trying to do beyond that.
Are you just looking to create a sort of blank row and column within your jotform that is completely empty with no titles in it?
Or did you want something like a Matrix possibly?
Can you please explain a little more about the workflow you seek involving the columns and rows you want to generate for your form so we can better assist you.