Word 2003

• 1). Open Microsoft Word 2003. Click on the "File" option from the menu at the top of the application and then click on the "Open" option.
  
  
• 2). Locate the Word 2003 document on your computer that contains the table you want to add columns to. Click on the file to highlight it and then click on the "Open" button.
  
  
• 3). Click on the area in the table where you want to add columns to. Click on the "Table" option from the top menu.
  
  
• 4). Move your mouse over the "Insert" option and the click on the "Column" option. A column will then appear on the left side of your table.
  
  
• 5). Move your cursor to the "Insert" option again and click on the "Columns to the Right" option if you want columns to appear to the right of your table.
  
  

Word 2007

• 1). Open Microsoft Word 2007. Click on the "Microsoft Office" button and then select the "Open" option.
  
  
• 2). Find the Word 2007 document that includes the table that you want to add columns to and select the file. Click on the "Open" button.
  
  
• 3). Click on any cell of your table where you want to add the new column next to. Click on the "Layout" tab.
  
  
• 4). Click on the "Insert Left" or "Insert Right" option from the Rows and Columns group and the new column will be added to your table.