Please explain just what you are trying to do.
I guess you want to achive exposure bracketing?
If yes, you can use Adobe camera raw dialog for the same.
If you want to merge different bracket shots, the best way to do it is to use Photomerge Exposure
to know more about photomerge exposure, click here: http://helpx.adobe.com/photoshop-elements/using/enhancing.html#main-pars_heading_4