Using Datasets

Where can I get more information on how to use Datasets in Zephyr for Jira (in the cloud).

I defined a Dataset "Application Pages" and have a list of the pages in the application (Page 1, Page 2, etc).  But I cannot find a way to add another column to that dataset to tie any additional information to those pages. 

AND when I add the dataset to a test case, it requires me to choose each entry in the dataset as a row to the table at the top of the test.

I was expecting to be able to define a Dataset as a multidimensional object (table with multiple columns) like when I'm doing the "Custom Input" that is directly in the test case.  Is there a way to do a table like that and have it shared across multiple test cases?

Given the way that Datasets seem to be working, I'm not seeing the value of them vs just putting the Custom Input data in each test case.  How are people using them?

Thanks!