I want to add quantity(area in sqm or no.s)

hi planners,

how can i assign and define the area of a project..means the schedule for glazing of a building,the wbs prepared is based on floors-

1st floor,2nd floor etc..

i want to add and show the total area of glass using in each floor and no of doors and windows in each floor..

1st Floor

Activity description      Percent complete          Original duration         Quantity

   Doors and windows                0                               9                                 -

       Glazing                              0                               14                               -

please reply..

vineeth