working with check boxes

hi

i want to develop a report such that based on the selection of the checkboxes the output column should be displayed. for example , lets say there are 3 columns as a,b,c

a | b | c

now the user should be able to select  all the possible way from single column to all together.... could any one please help  me out how to generate such report.... it would be great help

thanks,Regards

Sai .G