Modifying an assembly by changing dimensions in Drawing mode

Hello

    

          I have prepared an assembly using parts made in sheet-metal. Now i am trying to make drawing of that assembly and i want the dimensions to be editable in the "Drawing

and Detailing" mode itself so that if i change the dimensions in drawing, the dimension in the assembly gets modified accordingly.

I am able to do it for a part drawing but not for an assembly.

Kindly assist.

Mayank Jain

SolidworksDrawings And Detailing