I have attached a sample solution. I prepared a more lengthy tutorial but the upload erased my original comment. You'll need to understand how to access the Explore Component properties window to locate the RemoveAt method for the DataTableProxy's Columns property. You'll also need to understand how to extract a proxy.
You could also just iterate through your HTML Table using the InstanceCount property as the limit for a ForLoop and call the SetCellValue method of the Excel connector. This way would be a lot slower though.