Reports don’t have columns. You can set the page to be split on columns (create a newspaper style reports), you can create a tabular report layout with the Table item or align report items to mimic columns. I’m not sure what’s the exact case here.
If you prefer you may generate the report definition programmatically. As a reference source we highly recommend creating the desired report layout through the Report Designer first and then review the code in the InitializeComponent to see the internal structure. Still we have attached a sample report that is generating dynamically its table definition. It uses the AdventureWorks database installed along with the product.
You may also find useful the following help articles:
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