Once you assign attributes to a class, they show up in the classification search results table as columns. Look in your classification admin guide for "Assign Attributes to Class" section. If you've already done this and they still don't show up, make sure you did not create a view that didn't include them, or hid them. Out of the box, the default view shows all attributes assigned to a class.
Thanks for you reply, I think my case is a little different as I need some attribute of the item which is not related to classification basically like the project,release status, etc to be shown in those columns ...
That table is only for classification attribute search results. As Yuri mentioned, you'll need to make classification attributes that are reference attributes. Reference attributes inherit their value from the item (or master form or item revision or whatever you specify). You won't ever have to fill them out, but you do need to assign them to your classes to have them viewable in the table results.