Edit the Base.Datasets.Members table template. The EDIT statement, along with the table template DEFINE statements and attributes, modifies the Base.Datasets.Members table template. For more information about creating and modifying table templates, see TEMPLATE Procedure: Creating Tabular Output.

proc template;
   edit Base.Datasets.Members;
      header hd1;
      footer ft1;
      define hd1;
         preformatted=on;
         just=l;
         text"     Table Header with Leading and Trailing Blanks    ";
      end;
      define ft1;
         preformatted=on;
         just=l;
         text"     Table Footer with Leading and Trailing Blanks    ";
      end;
      edit name;
       define header myheader;
         just=l;
         preformatted=on;
         text "     My new header";
       end;
       header=myheader;
       width=memname_width width_max=memname_width_max;
       preformatted=on;
      end;
   end;
run;